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ADSD-1402
Dual, 14-Bit, 2MSPS Sampling A/D Converter
FEATURES
* * * * * * * * * 14-bit resolution; 2MSPS sampling rate Functionally complete; 5V input range No missing codes over full temperature range Edge-triggered; No pipeline delays 5V supplies, 0.725 Watts Small, 40-pin, side-brazed, ceramic TDIP 79dB SNR, -80dB THD Ideal for both time and frequency domain applications Out-of-range indicator
INPUT/OUTPUT CONNECTIONS
PIN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 FUNCTION INPUT A +5VA ANALOG GROUND GAIN A OFFSET A RANGE 2.5V REF ANALOG GROUND -5V ENABLE A START A +5VD BIT 14 (LSB) BIT 13 BIT 12 BIT 11 BIT 10 BIT 9 BIT 8 DGND PIN 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 FUNCTION INPUT B +5VA ANALOG GROUND GAIN B OFFSET B N/C N/C ANALOG GROUND -5V ENABLE B START B EOC BIT 1 (MSB) BIT 2 BIT 3 BIT 4 BIT 5 BIT 6 BIT 7 DGND
GENERAL DESCRIPTION
DATEL's ADSD-1402 is a functionally complete, dual 14-bit, 2MSPS, sampling A/D converter. Its standard, 40-pin, triplewide ceramic DIP contains two fast-settling sample/hold amplifiers, two 14-bit A/D converters, multiplexed output buffers, a precision reference, and all the timing and control logic necessary to operate from either two or a single start convert pulse. The ADSD-1402 is optimized for wideband frequencydomain applications and is fully FFT tested. The ADSD-1402 requires only 5V supplies and typically consumes 0.725 Watts. Models are available in either commercial 0 to +70C or military -55 to +125C operating temperature ranges.
O FFS E T A D JU S T A AN ALO G IN P U T A
5 1 800 + S /H 1 ADC 1 28 27 AMP 26 25 800 + S /H 2 ADC 2 24 23 22 19 AMP BUFFER REF 18 17 16 15 14 13 BUFFER B 1 (M S B ) B2 B3 B4 B5 B6 B7 B8 B9 B10 B11 B12 B13 B14
O FFS E T A D JU S T B 36 AN ALO G IN P U T B 40
RANGE EN ABLE B
6 31
EN ABLE A 10 START CON A START CON B 11 30 T IM IN G A N D C O N T R O L L O G IC
EO C 29 12 +5VD 9,32 5V 2,39 +5VA 3,8,33,38, AGND 20,21 DGND 34,35 N /C
Figure 1. ADSD-1402 Functional Block Diagram
DATEL, Inc., 11 Cabot Boulevard, Mansfield, MA 02048-1151 (U.S.A.) * Tel: (508) 339-3000 Fax: (508) 339-6356 * For immediate assistance: (800) 233-2765
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ABSOLUTE MAXIMUM RATINGS
PARAMETERS +5V Supply (Pins 2, 12, 39) -5V Supply (Pins 9, 32) Digital Inputs (Pins 3, 10, 11, 31) Analog Input (Pins 1, 40) Lead Temp. (10 seconds) LIMITS 0 to +6 0 to -6 -0.3 to +VDD +0.3 7 +300 UNITS Volts Volts Volts Volts C DYNAMIC PERFORMANCE Total Harm. Distort. (-0.5dB) dc to 500kHz 500kHz to 1MHz Signal-to-Noise Ratio (w/o distortion, -0.5dB dc to 500kHz 500kHz to 1MHz Signal-to-Noise Ratio (and distortion, -0.5dB) dc to 500kHz 500kHz to 1MHz Spurious Free Dyn. Range dc to 500kHz 500kHz to 1MHz Two-tone IMD Distortion (fin = 975kHz, fs = 2.0Mhz, -0.5dB) Input Bandwidth (-3dB) Small Signal (-20dB input) Large Signal (-0.5dB input) Slew Rate Aperture Delay Time Aperature Uncertainty S/H Acq. Time, (to 0.003%FSR) Step input Conversion Rate Feedthrough Rejection (fin = 1MHz) Noise POWER REQUIREMENTS Power Supply Ranges -5V Supply +5V Supply Power Supply Currents -5V Supply +5V Supply Power Dissipation Power Supply Rejection PHYSICAL/ENVIRONMENTAL Oper. Temp. Range, Ambient ADSD-1402MC ADSD-1402MM Storage Temperature Range Package Type 0 -- +70 -55 -- +125 -65 -- +150 40-pin, metal-sealed, ceramic C C C TDIP -5.25 +4.75 -80 -- -- -- -5 +5.0 -70 +50 0.6 -- -4.75 +5.25 -- +70 0.725 0.01 Volts Volts mA mA Watts %FSR%V MIN. -- -- 75 75 71 69 -- -- -76 -- -- -- -- -- -- 2 -- -- TYP. -79 -73 79 78 76 73 -85 -74 -- 16 12 250 -- -- 100 -- 85 250 MAX. -72 -70 -- -- -- -- -70 -70 -- -- -- -- 10 5 150 -- -- -- UNITS dB dB dB dB dB dB dB dB dB MHz MHz V/s ns ps ns MHz dB Vrms
FUNCTIONAL SPECIFICATIONS
(TA = +25C, +VDD = +5V, Vee = -5V, 2MSPS sampling rate,Vin = 5V and a minimum 7 minute warmup unless otherwise specified.) ANALOG INPUTS MIN. TYP. MAX. UNITS Input Voltage Range Input Impedence Input Capacitance DIGITAL INPUTS Logic Levels Logic "1" Logic "0" Logic Loading "1" Logic Loading "0" PERFORMANCE Integral Non-Linearity +25C(fin=10kHz) 0 to +70C -55 to +125C Differential Non-Linearity (fin = 10kHz) +25C 0 to +70C -55 to +125C Offset Error +25C (see Figure 3) 0 to +70C -55 to +125C Gain Error +25C (see Figure 3) 0 to +70C -55 to +125C No Missing Codes (fin = 975kHz) 14 Bits Resolution OUTPUTS Output Coding Logic Level Logic "1" Logic "0" Logic Loading "1" Logic Loading "0" Internal Reference Voltage, +25C 0 to +70C External Current Offset Bin. +2.4 -- -- -- +2.45 +2.45 -- -- -- -- -- +2.5 +2.5 -- -- +0.4 -160 +6.4 +2.55 +2.55 5 Volts Volts A mA Volts Volts mA -- -- -- -0.99 -0.99 -0.99 -- -- -- -- -- -- 1 1 2 0.5 0.5 0.75 0.25 0.25 0.5 0.3 0.3 0.6 -- -- -- +1.75 +1.75 +1.75 0.5 0.5 0.8 0.6 0.6 0.8 LSB LSB LSB LSB LSB LSB %FSR %FSR %FSR %FSR %FSR %FSR +2.0 -- -- -- -- -- -- -- -- +0.8 +5 -600 Volts Volts A A -- -- -- 5V 800 7 -- -- 15 Volts pF
-55 to +125C 14 Bits
Footnote:
Same specification as In-Band Harmonics and Peak Harmonics.
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TECHNICAL NOTES
1. Rated performance requires using good high-frequency circuit board layout techniques. Connect the digital and analog grounds to one point, the analog ground plane beneath the converter. Due to the inductance and resistance of the power supply return paths, return the analog and digital ground separately to the power supplies. 3. Full-Scale (Gain) Adjustments Set the output of the voltage reference used in step 2 to the value shown in Table 2.
Table 2. Offset and Gain Adjustments
CALIBRATION PROCEDURE
1. Connect the converter per Figure 3. Apply a pulse of 100 nanoseconds minimum to START CONVERT (pin 11) at a rate of 200kHz. This rate is chosen to reduce flicker if LED's are used on the outputs for calibration purposes. 2. Zero (Offset) Adjustments Apply a precision voltage reference source between ANALOG INPUT A (pin 1) and SIGNAL GROUND (pin 3), then adjust the reference source output per Table 2. Adjust trimpot R2 until the code flickers equally between 10 0000 0000 0000 and 10 0000 0000 0001.
Input Range 5V
Offset Adjust +1/2 LSB +0.000305V
Gain Adjust FS - 11/2 LSB +4.999085V
Adjust the gain trimpot R1 until the output code flickers equally between 11 1111 1111 1110 and 11 1111 1111 1111 4. Repeat above steps for Analog Input B (Pin 40). Use trimpot R3 for the zero (Offset) adjustment and trimpot R4 for the Full-Scale (Gain) adjustment. 5. To confirm proper operation of the device, vary the precision reference voltage source to obtain the output coding listed in Table 3.
N+1 400 nSec.
25 nSec. per division N START CONVERT
100 nSec.
EOC DATA OUT ENABLE A
325 nSec. 175 nSec. DATA N VALID
75 nSec. ENABLE B Data N A DATA A or B OUT HIGH Z
75 nSec. Data N B HIGH Z
HIGH Z
Figure 2. ADSD-1402 Timing Diagram
Table 3. Output Coding
OUTPUT CODING MSB LSB
INPUT RANGE 5V
BIPOLAR SCALE
11 11 11 10 01 00 00 00
1111 1000 0000 0000 0000 1000 0000 0000
1111 1111 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0001 0000 0000
+4.999390 +4.250000 +2.500000 0.000000 -2.500000 -4.250000 -4.999390 -5.000000
+FS - 1LSB +3/4FS +1/2FS 0 -1/2FS -3/4FS -FS+1LSB -FS
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5V .1 u F .1 u F +5V
In p u t B
10uF 9,32 0 .1 F 10uF 7 2 .5 V R E F . 6 R ange 3,8,20,21,33,38 G N D
10uF
2,12,39 N /C EOC 34,35 29 28 27 26 25 24 23 22 19 18 B IT 1 (M S B ) B IT 2 B IT 3 B IT 4 B IT 5 B IT 6 B IT 7 B IT B IT B IT B IT B IT B IT B IT 8 9 10 11 12 13 1 4 (L S B )
1 In A 4 0 In B 10K 4 G a in A
R1 R2 R3 R4
10K 10K 10K
5 O ffs e t A 3 6 O ffs e t B 3 7 G a in B
A D S D -1 4 0 2
+5V
5V
1 1 S ta rt A 3 0 S ta rt B E n a b le B E n a b le A +5V 10 SW 1 31 SW 2
See timing diagram for details. Notes:
Recommended to use same supply source for +5 Analog and +5 Digital. Try using as clean of a supply as possible (Bypass caps., 10uF and .1uF). Outputs are enabled by either turning ENABLE A (Pin 10) or ENABLE B (Pin 31) low for prespective analog inputs A or B. A high on ENABLE A or ENABLE B results in disabling the output bus (High Z).
Figure 3. ADSD-1402 Connection Diagram
THERMAL REQUIREMENTS
The ADSD-1402 sampling A/D converter is fully characterized and specified over the commercial operating temperature (ambient) range of 0 to +70C (MC suffix) and military temperature range of -55 to +125C (MM suffix). All roomtemperature (TA = +25C) production testing is performed without the use of heat sinks or forced-air cooling. Thermal impedance figures for each device are listed in their respective specification tables. These devices do not normally require heat sinks, however, standard precautionary design and layout procedures should be used to ensure devices do not overheat. The ground and power planes beneath the package, as well as all pcb signal runs to and from the device, should be as heavy as possible to help conduct heat away from the package. Electrically-insulating, thermally-conductive "pads" may be installed underneath the package. Devices should be soldered to boards rather than "socketed", and of course, minimal air flow over the surface can greatly help reduce the package temperature. In more severe ambient conditions, the package/junction temperature of a given device can be reduced dramatically (typically 35%) by using one of DATEL's HS Series heat sinks. See Ordering Information for the assigned part number. Request DATEL Application Note AN-8, "Heat Sinks for DIP Data Converters", or contact DATEL directly, for additional information.
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+ 17 16 15 14 13 +5V
In p u t A
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ADSD-1402
MECHANICAL DIMENSIONS INCHES (mm)
2.12/2.07 (53.85/52.58)
40
21
Dimension Tolerances (unless otherwise indicated): 2 place decimal (.XX) 0.010 (0.254) 3 place decimal (.XXX) 0.005 (0.127) Lead Material: Kovar alloy
1.11/1.08 (28.20/27.43)
Lead Finish: 50 microinches (minimum) gold plating over 100 microinches (nominal) nickel plating
1
20
0.100 TYP. (2.540) 1.900 0.008 (48.260) 0.245 MAX. (6.223)
PIN 1 INDEX ( ON TOP)
0.200/0.175 (5.080/4.445)
0.015/0.009 (0.381/0.229) 0.210 MAX. (5.334) 0.018 0.002 (0.457) 0.045/0.035 (1.143/0.889) 0.110/0.090 (2.794/2.286) SEATING PLANE 0.035/0.015 (0.889/0.381) 0.900 0.010 (22.86) 0.110/0.090 (2.794/2.286
ORDERING INFORMATION
MODEL NUMBER ADSD-1402MC ADSD-1402MM OPERATING TEMP. RANGE 0 to +70C -55 to +125C ACCESSORIES HS-40 Heat Sink for all ADSD-1402 models
Contact DATEL for high-reliability versions
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ISO 9001
REGISTERED
DS-0520C 11/03
DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 Tel: (508) 339-3000 / Fax: (508) 339-6356 For immediate assistance: (800) 233-2765 Internet: www.datel.com
DATEL (UK) LTD. Tadley, England Tel: (01256)-880444 DATEL S.A.R.L. Montigny Le Bretonneux, France Tel: 1-34-60-01-01 DATEL GmbH Munchen, Germany Tel: 89-544334-0 DATEL KK Tokyo, Japan Tel: 3-3779-1031, Osaka Tel: 6-6354-2025
DATEL makes no representation that the use of its products in the circuits described herein, or the use of other technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do not imply the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifications are subject to change without notice. The DATEL logo is a registered DATEL, Inc. trademark.

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