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Final Electrical Specifications
LTC1664 Micropower Quad 10-Bit DAC
January 2000
FEATURES
s s
DESCRIPTIO
s s s
s
s s s
Tiny: 4 DACs in the Board Space of an SO-8 Micropower: 59A per DAC Plus 1A Sleep Mode for Extended Battery Life Wide 2.7V to 5.5V Supply Range Rail-to-Rail Voltage Outputs Drive 1000pF Reference Range Includes Supply for Ratiometric 0V-to-VCC Output Reference Input Has Constant Impedance over All Codes--Eliminates External Reference Buffer Individually Addressable DACs Differential Nonlinearity: 0.75LSB Max Pin-Compatible Octal Version Available (LTC1660)
The LTC(R)1664 integrates four accurate, serially addressable 10-bit digital-to-analog converters (DACs) in a tiny 16-pin Narrow SSOP package. Each buffered DAC draws just 59A total supply current, yet is capable of supplying DC output currents in excess of 5mA and reliably driving capacitive loads of up to 1000pF. Sleep mode further reduces total supply current to 1A. Linear Technology's proprietary, inherently monotonic voltage interpolation architecture provides excellent linearity while allowing for an exceptionally small external form factor. Ultralow supply current, power-saving Sleep mode and extremely compact size make the LTC1664 ideal for battery-powered applications, while its ease of use, high performance and wide supply range make it an excellent choice as a general purpose converter.
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATIO S
s s s s s
Mobile Communications Remote Industrial Devices Automatic Calibration for Manufacturing Portable Battery-Powered Instruments Trim/Adjust Applications
BLOCK DIAGRA
GND 1 10-BIT DAC A
16 VCC 10-BIT DAC D 5 VOUT D
VOUT A
2
LTC1664 Differential Nonlinearity (DNL)
1 0.8 0.6 VCC = 5V VREF = 4.096V
VOUT B
3
10-BIT DAC B
10-BIT DAC C
4
VOUT C
LSB
0.4 0.2 0 -0.2
CONTROL LOGIC REF CS/LD SCK 6 7 8
ADDRESS DECODER 11 10 9 CLR DOUT DIN
1664 BD
-0.4 -0.6 -0.8
SHIFT REGISTER
-1 0 256 512 CODE 768 1023
1664 G08
Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
U
W
U
1
LTC1664 ABSOLUTE
(Note 1)
AXI U
RATI GS
PACKAGE/ORDER I FOR ATIO
TOP VIEW GND VOUT A VOUT B VOUT C VOUT D REF CS/LD SCK 1 2 3 4 5 6 7 8 16 VCC 15 NC 14 NC 13 NC 12 NC 11 CLR 10 DOUT 9 DIN
VCC to GND .............................................. - 0.2V to 7.5V Logic Inputs to GND ................................ - 0.2V to 7.5V VOUT A, VOUT B...VOUT D, REF to GND ................................. - 0.2V to (VCC + 0.2V) Maximum Junction Temperature ......................... 125C Operating Temperature Range LTC1664C ............................................. 0C to 70C LTC1664I ........................................... - 40C to 85C Storage Temperature Range ................ - 65C to 150C Lead Temperature (Soldering, 10 sec)................ 300C
ORDER PART NUMBER LTC1664CGN LTC1664CN LTC1664IGN LTC1664IN
GN PACKAGE 16-LEAD PLASTIC SSOP
N PACKAGE 16-LEAD PDIP
GN PART MARKING 1664 1664I
TJMAX = 125C, JA = 150C/W (GN) TJMAX = 125C, JA = 100C/W (N)
Consult factory for Military grade parts.
ELECTRICAL CHARACTERISTICS
The q denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. VCC = 2.7V to 5.5V, VREF VCC, VOUT unloaded, unless otherwise noted.
SYMBOL Accuracy Resolution Monotonicity DNL INL VOS FSE PSR Differential Nonlinearity Integral Nonlinearity Offset Error VOS Temperature Coefficient Full-Scale Error Full-Scale Error Temperature Coefficient Power Supply Rejection Input Voltage Range Resistance Capacitance IREF VCC ICC Reference Current Positive Supply Voltage Supply Current Power Supply For Specified Performance VCC = 5V (Note 3) VCC = 3V (Note 3) Sleep Mode (Note 3)
q q q q q
PARAMETER
CONDITONS
MIN 10 10
TYP
MAX
UNITS Bits Bits
1V VREF VCC - 0.1V (Note 2, 4) 1V VREF VCC - 0.1V (Note 2, 4) 1V VREF VCC - 0.1V (Note 2, 4) (Note 7) VCC = 5V, VREF = 4.096V (Note 4) VREF = 2.5V
q q q q q q q
0.2 0.6 10 15 3 30 0.18
0.75 2.5 30 15
V/C LSB V/C LSB/V VCC V k pF 1 5.5 A V A A A
Reference Input
q
0 70 130 15 0.001 2.7 236 186 1
Not in Sleep Mode (Note 6) Sleep Mode
q
q
380 290 3
2
U
LSB LSB mV
W
U
U
WW
W
LTC1664
ELECTRICAL CHARACTERISTICS
The q denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. VCC = 2.7V to 5.5V, VREF VCC, VOUT unloaded, unless otherwise noted.
SYMBOL PARAMETER Short-Circuit Current Low Short-Circuit Current High AC Performance Voltage Output Slew Rate Voltage Output Settling Time Capacitive Load Driving Digital I/O VIH VIL VOH VOL ILK CIN Digital Input High Voltage Digital Input Low Voltage Digital Output High Voltage Digital Output Low Voltage Digital Input Leakage Digital Input Capacitance VCC = 2.7V to 5.5V VCC = 2.7V to 3.6V VCC = 4.5V to 5.5V VCC = 2.7V to 5.5V IOUT = - 1mA, DOUT Only IOUT = 1mA, DOUT Only VIN = GND to VCC (Note 6)
q q q q q q q q
CONDITIONS VOUT = 0V, VCC = 5.5V, VREF = 5.1V, Code = Full Scale (Note 4) VOUT = VCC = 5.5V, VREF = 5.1V, Code = 0 (Note 4) Rising (Notes 4, 5) Falling (Notes 4, 5) To 0.5LSB (Notes 4, 5)
q q
MIN 10 10
TYP 30 27 0.60 0.25 30 1000
MAX 100 120
UNITS mA mA V/s V/s s pF V V
DC Performance
2.4 2.0 0.8 0.6 VCC - 1 0.4 10 10
V V V V A pF
The q denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. (See Figure 1)
SYMBOL t1 t2 t3 t4 t5 t6 t7 t8 t9 t10 t11 PARAMETER DIN Valid to SCK Setup DIN Valid to SCK Hold SCK High Time SCK Low Time CS/LD Pulse Width LSB SCK High to CS/LD High CS/LD Low to SCK High DOUT Propagation Delay SCK Low to CS/LD Low CLR Pulse Width CS/LD High to SCK Positive Edge SCK Frequency (Note 6) (Note 6) (Note 6) (Note 6) (Note 6) CLOAD = 15pF (Note 6) (Note 6) (Note 6) (Note 6) Continuous Square Wave (Note 6) Continuous 23% Duty Cycle Pulse (Note 6) Gated Square Wave (Note 6) (Note 6) (Note 6) (Note 6) (Note 6) (Note 6) CONDITIONS
q q q q q q q q q q q q q q
TI I G CHARACTERISTICS
VCC = 4.5V to 5.5V 40 0 30 30 80 30 80 5 20 100 30 15 -11 5 7 30 4 26 26 0 37 0 5.00 7.69 16.7 60 0 50 50 100 20 -14 8 12 30 80 ns ns ns ns ns ns ns ns ns ns ns MHz MHz MHz ns ns ns ns ns
VCC = 2.7V to 5.5V t1 t2 t3 t4 t5 DIN Valid to SCK Setup DIN Valid to SCK Hold SCK High Time SCK Low Time CS/LD Pulse Width
q q q q q
UW
MIN
TYP
MAX
UNITS
3
LTC1664
The q denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. (See Figure 1)
SYMBOL t6 t7 t8 t9 t10 t11 PARAMETER LSB SCK High to CS/LD High CS/LD Low to SCK High DOUT Propagation Delay SCK Low to CS/LD Low CLR Pulse Width CS/LD High to SCK Positive Edge SCK Frequency CONDITIONS (Note 6) (Note 6) CLOAD = 15pF (Note 6) (Note 6) (Note 6) (Note 6) Continuous Square Wave (Note 6) Continuous 28% Duty Cycle Pulse Gated Square Wave
q q q q q q q q q
TI I G CHARACTERISTICS
Note 1: Absolute maximum ratings are those values beyond which the life of a device may be impaired. Note 2: Nonlinearity and monotonicity are defined from code 20 to code 1023. See Applications Information. Note 3: Digital inputs at 0V or VCC. Note 4: Load is 10k in parallel with 100pF.
TYPICAL PERFOR A CE CHARACTERISTICS
Integral Nonlinearity (INL)
2.5 2.0 1.5 1.0 0.5
LSB 1
VCC = 5V VREF = 4.096V
0.4 0.2
SUPPLY CURRENT (A)
LSB
0 - 0.5 -1.0 -1.5 - 2.0 - 2.5 0 256 512 CODE 768 1023
1664 G07
4
UW
UW
MIN 50 100 5 30 120 30
TYP 5 27 47 0 41 0
MAX
UNITS ns ns
150
ns ns ns ns
3.85 5.55 10
MHz MHz MHz
Note 5: VCC = VREF = 5V. DAC switched between 0.1VFS and 0.9VFS, i.e., codes 102 and 922. Note 6: Guaranteed by design and not subject to test. Note 7: Measured at code 20.
Differential Nonlinearity (DNL)
250
VCC = 5V VREF = 4.096V 0.8 0.6
Supply Current vs Temperature
240 230 220 210 200 190 180 170 160 VCC = 2.7V VCC = 5.5V VCC = 4.5V VCC = 3.6V
0 -0.2 -0.4 -0.6 -0.8 -1 0 256 512 CODE 768 1023
1664 G08
150 -55 -35 -15
5 25 45 65 85 105 125 TEMPERATURE (C)
1664 G06
LTC1664 TYPICAL PERFOR A CE CHARACTERISTICS
Midscale Output Voltage vs Load Current
3 2.9 2.8 2.7 VCC = 5.5V
VOUT (V)
VREF = VCC CODE = 512
VOUT (V)
2.6 2.5 2.4 2.3 2.2 2.1 2 -30 -20 SOURCE -10 SINK 20 30
1664 G01
1.6 1.5 1.4 1.3 1.2 1.1 1 -15 -12 -8 SOURCE SINK VCC = 2.7V VCC = 3V
VCC - VOUT (mV)
VCC = 5V
VCC = 4.5V
0 10 IOUT (mA)
Minimum VOUT vs Load Current (Output Sinking)
1400 1200 1000 VCC = 5V CODE = 0 5 125C
VOUT (LSB)
VOUT (mV)
25C 600 -55C 400
VOUT (V)
800
200 0 0 2 0
|IOUT| (mA) (Sinking)
4
6
VOUT (LSB)
UW
8
Midscale Output Voltage vs Load Current
2 1.9 1.8 1.7 VCC = 3.6V 1000 800 600 VREF = VCC CODE = 512 1400 1200
Minimum Supply Headroom vs Load Current (Output Sourcing)
VREF = 4.096V VOUT < 1LSB CODE = 1023 125C 25C -55C 400 200 0
-4 0 4 IOUT (mA)
8
12 15
1664 G02
0
2
|IOUT| (mA) (Sourcing)
4
6
8
10
1664 G03
Large-Signal Step Response
VCC = VREF = 5V 10% TO 90% STEP
Load Regulation vs Output Current
2 1.5 1 0.5 0 -0.5 -1 VCC = VREF = 5V CODE = 512
4
3
2
1
-1.5 -2 SOURCE -2 -1 0 IOUT (mA) SINK 1 2
1664 G09
10
1664 G04
0
20
40 60 TIME (s)
80
100
1664 G05
Load Regulation vs Output Current
2 1.5 1 0.5 0 -0.5 -1 -1.5 -2 -500 SOURCE 0 IOUT (A) SINK 500
1664 G10
VCC = VREF = 3V CODE = 512
5
LTC1664
PIN FUNCTIONS
GND (Pin 1): System Ground. VOUT A to VOUT D (Pins 2-5): DAC Analog Voltage Outputs. The output range is 1023 0 to V 1024 REF REF (Pin 6): Reference Voltage Input. 0V VREF VCC. CS/LD (Pin 7): Serial Interface Chip Select/Load Input. When CS/LD is low, SCK is enabled for shifting data on DIN into the register. When CS/LD is pulled high, SCK is disabled and data is loaded from the shift register into the specified DAC register(s), updating the analog output(s). CMOS and TTL compatible. SCK (Pin 8): Serial Interface Clock Input. CMOS and TTL compatible. DIN (Pin 9): Serial Interface Data Input. Data on the DIN pin is shifted into the 16-bit register on the rising edge of SCK. CMOS and TTL compatible. DOUT (Pin 10): Serial Interface Data Output. Data appears on DOUT 16 positive SCK edges after being applied to DIN. May be tied to DIN of another serial device for daisy-chain operaton. CMOS and TTL compatible. CLR (Pin 11): Asynchronous Clear Input. All internal shift and DAC registers are cleared to zero at the falling edge of the CLR signal, forcing the analog outputs to zero scale. CMOS and TTL compatible. NC (Pins 12-15): Make no electrical connection to these pins. VCC (Pin 16): Supply Voltage Input. 2.7V VCC 5.5V.
6
U
U
U
LTC1664
BLOCK DIAGRA
VOUT A
VOUT B
TI I G DIAGRA
SCK t9 DIN t5 CS/LD
DOUT
W
W
GND 1 10-BIT DAC A 10-BIT DAC D 16 VCC 5 VOUT D 2 3 10-BIT DAC B 10-BIT DAC C 4 VOUT C CONTROL LOGIC REF CS/LD SCK 6 7 8 ADDRESS DECODER 11 10 9 CLR DOUT DIN
1664 BD
SHIFT REGISTER
UW
t1 t2 t3 t4 t6
t11 A3 t7 A2 A1 X1 X0
t8 A3 A2 A1 X1 X0 A3
1664 F01
Figure 1
7
LTC1664
OPERATIO
Transfer Function The transfer function is k VOUT(IDEAL) = V 1024 REF where k is the decimal equivalent of the binary DAC input code and VREF is the voltage at REF (Pin 6). Power-On Reset The LTC1664 clears the outputs to zero scale when power is first applied, making system initialization consistent and repeatable. Power Supply Sequencing The voltage at REF (Pin 6) should be kept within the range - 0.2V VREF VCC + 0.2V (see Absolute Maximum Ratings). Particular care should be taken to observe these limits during power supply turn-on and turn-off sequences, when the voltage at VCC (Pin 16) is in transition. Serial Interface Referring to Figure 2: With CS/LD held low, data on the D IN input is shifted into the 16-bit shift register on the positive edge of SCK. The 4-bit DAC address, A3-A0, is loaded first (see Table 2), then the 10-bit input code, D9-D0, ordered MSB-to-LSB in each case. Two don't-care bits, X1-X0, are loaded last. When the full 16-bit input word has been shifted in, CS/LD is pulled high, loading the DAC register with the word and causing the addressed DAC output(s) to update. The clock is disabled internally when CS/LD is high. Note: SCK must be low before CS/LD is pulled low.
8
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The buffered serial output of the shift register is available on the DOUT pin, which swings from GND to VCC. Data appears on DOUT 16 positive SCK edges after being applied to DIN. Multiple LTC1664's can be controlled from a single 3-wire serial port (i.e., SCK, DIN and CS/LD) by using the included "daisy-chain" facility. A series of m chips is configured by connecting each DOUT (except the last) to DIN of the next chip, forming a single 16m-bit shift register. The SCK and CS/LD signals are common to all chips in the chain. In use, CS/LD is held low while m 16-bit words are clocked to DIN of the first chip; CS/LD is then pulled high, updating all of them simultaneously. Sleep Mode DAC address 1110b is reserved for the special Sleep instruction (see Table 2). In this mode, the digital interface stays active while the analog circuits are disabled; static power consumption is thus virtually eliminated. The reference input and analog outputs are set in a high impedance state and all DAC settings are retained in memory so that when Sleep mode is exited, the outputs of DACs not updated by the Wake command are restored to their last active state. Sleep mode is initiated by performing a load sequence to address 1110b (the DAC input word D9-D0 is ignored). Once in Sleep mode, a load sequence to any other address (including "No Change" addresses 0000b and 1001-1101b) causes the LTC1664 to Wake. It is possible to keep one or more chips of a daisy chain in continuous Sleep mode by giving the Sleep instruction to these chips each time the active chips in the chain are updated.
Table 1. LTC1664 Input Word
A3 A2 A1 A0 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 X1 X0 Address/Control Input Code Don't Care
LTC1664
OPERATIO
SCK
DIN
CS/LD
(ENABLE SCK)
DOUT
U
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 A3 A2 A1 A0 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 X1 X0 ADDRESS/CONTROL INPUT CODE INPUT WORD W0 (UPDATE OUTPUT) DON'T CARE A3 A2 A1 A0 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 X1 X0 A3 INPUT WORD W-1 INPUT WORD W0
1664 F02
Figure 2. LTC1664 Register Loading Sequence
Table 2. DAC Address/Control Functions
ADDRESS/CONTROL A3 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 A2 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 A1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 A0 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 DAC STATUS No Change Load DAC A Load DAC B Load DAC C Load DAC D Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved No Change Load ALL DACs with Same 10-Bit Code Sleep Wake SLEEP STATUS Wake Wake Wake Wake Wake
9
LTC1664
OPERATIO
Voltage Outputs
Each of the four rail-to-rail output amplifiers contained in these parts can source or sink up to 5mA. The outputs swing to within a few millivolts of either supply rail when unloaded and have an equivalent output resistance of 85 when driving a load to the rails. The output amplifiers are stable driving capacitive loads up to 1000pF. A small resistor placed in series with the output can be used to achieve stability for any load capacitance. A 1F load can be successfully driven by inserting a 20 resistor; a 2.2F load needs only a 10 resistor. In either case, larger values of resistance, capacitance or both may be safely substituted for the values given.
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Rail-to-Rail Output Considerations In any rail-to-rail voltage output DAC, the output is limited to voltages within the supply range. If the DAC offset is negative, the output for the lowest codes limits at 0V as shown in Figure 3b. Similarly, limiting can occur near full scale when the REF pin is tied to VCC. If VREF = VCC and the DAC full-scale error (FSE) is positive, the output for the highest codes limits at VCC as shown in Figure 3c. No full-scale limiting can occur if VREF is less than VCC - FSE. Offset and linearity are defined and tested over the region of the DAC transfer function where no output limiting can occur.
LTC1664
OPERATIO
OUTPUT VOLTAGE
0V NEGATIVE OFFSET INPUT CODE (b)
1665/60 F03
Figure 3. Effects of Rail-to-Rail Operation On a DAC Transfer Curve. (a) Overall Transfer Function (b) Effect of Negative Offset for Codes Near Zero Scale (c) Effect of Positive Full-Scale Error for Input Codes Near Full Scale When VREF = VCC
U
VREF = VCC POSITIVE FSE OUTPUT VOLTAGE INPUT CODE (c) VREF = VCC OUTPUT VOLTAGE 0 512 INPUT CODE (a) 1023
11
LTC1664
TYPICAL APPLICATIONS
A Low Power Dual Trim Circuit with Coarse/Fine Adjustment
3.3V R1 0.1F 8 2 GND R1 COARSE V OUT A U1 LTC1664 R2 0.1F
1 VOUT1
U2A LT(R)1490 4
2
DAC A
DAC D
5
0.1F 3.3V 2 LTC1258-2.5 4 CS/LD 7 1 REF 6 CONTROL LOGIC ADDRESS DECODER 11 CLR R2 FINE 0.1F VOUT B VOUT C R2 FINE
0.1F
3
DAC B
DAC C
4
10
DOUT
TO OTHER LTC1664s
3-WIRE SERIAL INTERFACE
SCK
8
SHIFT REGISTER
9
DIN
1664 TA01
R2 >> R1 VOUT 1 = VOUT A + R1 VOUT B R2 Similarly VOUT 2 Example: For R1 = 110 and R2 = 11k, VOUT 1 = VOUT A + 0.01 VOUT B
))
12
+
3
VOUT D
R1 COARSE
5
-
1
U
3.3V
R2 16 VCC 6
R1
- +
U2B LT1490
7 VOUT2
LTC1664
TYPICAL APPLICATIONS
A 4-Channel Bipolar Output Voltage Circuit Configuration
R 0.1F VS+ 4 VOUT A 1 0.1F 11 VS- R 6 U2A LT1491
R 0.1F U1 LTC1664 VCC
5V
2
DAC A
DAC D
5
R
R 9
VOUT B
7
5V
U2B LT1491
3
DAC B
DAC C
4
REF
6 CONTROL LOGIC ADDRESS DECODER
11
CLR
CS/LD
7
10
DOUT DIN
3-WIRE SERIAL INTERFACE
CLK
8
SHIFT REGISTER
9
1664 TA02
+
5
VOUT B
VOUT C
10
+
3
VOUT A
VOUT D
12
-
2
GND
-
U
5V R R
1
16
13
- - + +
U2D LT1491
14
VOUT D
5V
R
U2C LT1491
8
VOUT C
5V
CODE VOUT X - 5V 0 0V 512 1023 +4.99V
13
LTC1664
PACKAGE DESCRIPTION
0.007 - 0.0098 (0.178 - 0.249) 0.016 - 0.050 (0.406 - 1.270)
* DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE ** DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
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Dimensions in inches (millimeters) unless otherwise noted.
GN Package 16-Lead Plastic SSOP (Narrow 0.150)
(LTC DWG # 05-08-1641)
0.189 - 0.196* (4.801 - 4.978) 16 15 14 13 12 11 10 9
0.009 (0.229) REF
0.229 - 0.244 (5.817 - 6.198)
0.150 - 0.157** (3.810 - 3.988)
1 0.015 0.004 x 45 (0.38 0.10) 0 - 8 TYP 0.053 - 0.068 (1.351 - 1.727)
23
4
56
7
8 0.004 - 0.0098 (0.102 - 0.249)
0.008 - 0.012 (0.203 - 0.305)
0.0250 (0.635) BSC
GN16 (SSOP) 1098
LTC1664
PACKAGE DESCRIPTION U
Dimensions in inches (millimeters) unless otherwise noted.
N Package 16-Lead PDIP (Narrow 0.300)
(LTC DWG # 05-08-1510)
0.770* (19.558) MAX 16 15 14 13 12 11 10 9
0.255 0.015* (6.477 0.381)
1
2
3
4
5
6
7
8
0.300 - 0.325 (7.620 - 8.255)
0.130 0.005 (3.302 0.127) 0.020 (0.508) MIN
0.045 - 0.065 (1.143 - 1.651)
0.009 - 0.015 (0.229 - 0.381)
0.065 (1.651) TYP 0.125 (3.175) MIN 0.018 0.003 (0.457 0.076)
(
+0.035 0.325 -0.015 8.255 +0.889 -0.381
)
0.100 (2.54) BSC
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm)
N16 1098
15
LTC1664
TYPICAL APPLICATION
A Pin Driver VH and VL Adjustment Circuit for ATE Applications
5V 0.1F
11 CLR
16 VCC U1 LTC1664
DAC A
DAC B
DAC C
DAC D CS/LD DIN SCK 7 9 8 GND 1
RELATED PARTS
PART NUMBER LTC1665/LTC1660 LTC1661 LTC1663 LTC1446/LTC1446L LTC1448 LTC1454/LTC1454L LTC1458/LTC1458L LTC1590 LTC1659 LT1460 DESCRIPTION Octal 8/10-Bit VOUT DAC in 16-Pin Narrow SSOP Dual 10-Bit VOUT DAC in 8-Lead MSOP Package Single 10-Bit VOUT DAC with 2-Wire Interface in SOT-23 Package Dual 12-Bit VOUT DACs in SO-8 Package with Internal Reference Dual 12-Bit VOUT DAC in SO-8 Package Dual 12-Bit VOUT DACs in SO-16 Package with Added Functionality Quad 12-Bit Rail-to-Rail Output DACs with Added Functionality Dual 12-Bit IOUT DAC in SO-16 Package Single Rail-to-Rail 12-Bit VOUT DAC in 8-Lead MSOP Package VCC: 2.7V to 5.5V Micropower Precision Series Reference, 2.5V, 5V, 10V Versions COMMENTS VCC = 2.7V to 5.5V, Micropower, Rail-to-Rail Output VCC = 2.7V to 5.5V Micropower, Rail-to-Rail Output VCC = 2.7V to 5.5V, Internal Reference, 60A LTC1446: VCC = 4.5V to 5.5V, VOUT = 0V to 4.095V LTC1446L: VCC = 2.7V to 5.5V, VOUT = 0V to 2.5V VCC = 2.7V to 5.5V, External Reference Can Be Tied to VCC LTC1454: VCC = 4.5V to 5.5V, VOUT = 0V to 4.095V LTC1454L: VCC = 2.7V to 5.5V, VOUT = 0V to 2.5V LTC1458: VCC = 4.5V to 5.5V, VOUT = 0V to 4.095V LTC1458L: VCC = 2.7V to 5.5V, VOUT = 0V to 2.5V VCC = 4.5V to 5.5V, 4-Quadrant Multiplication Low Power Multiplying VOUT DAC. Output Swings from GND to REF. REF Input Can Be Tied to VCC 0.075% Max, 10ppm/C Max, Only 130A Supply Current
1664i LT/TP 0100 4K * PRINTED IN THE USA
16
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408)432-1900 q FAX: (408) 434-0507 q www.linear-tech.com
U
6 REF VH (FROM MAIN DAC) RG VA 50k RF 5k 3 10V 8 0.1F VH VL
2
+
U2A LT1368 1
VH = VH + VH 0.1F
2 RG VB 50k
-
4 - 5V 0.1F RF 5k
3
VL (FROM MAIN DAC) RG VC 50k RF 5k 5
VH VL VOUT
4
+
U2B LT1368 7
VL = VL + VL 0.1F
PIN DRIVER
6 RG VD 50k
-
RF 5k
LOGIC DRIVE
1664 TA03
5
VA = VC = 2.5V VH = VH + RF (V - V ) B RG A VL = VL + RF (V - V ) D RG C For Resistor Values Shown: Adjustment Range = 250mV Adjustment Step Size = 500V
CODE A CODE B VH, VL 512 1023 - 250mV 512 0 512 512 + 250mV 0
(c) LINEAR TECHNOLOGY CORPORATION 2000

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