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ADS-117
12-Bit, 2MHz, Low-Power Sampling A/D Converters
FEATURES
* * * * * * * * 12-bit resolution No missing codes 2MHz minimum throughput Functionally complete Small 24-pin DDIP Low-power, 1.6 Watts Three-state output buffers Samples to Nyquist frequencies
GENERAL DESCRIPTION
DATEL's ADS-117 is a functionally complete, 12-bit, 2MHz, sampling A/D converter. Its standard, 24-pin, double-width DIP contains a fast-settling sample-hold amplifier, a 12-bit subranging (two-step) A/D converter, a precision reference, three-state output register and all the timing and control logic necessary to operate from a single start convert pulse. Digital input and output levels are TTL. Total harmonic distortion (THD) and signal-to-noise ratio (including distortion) typically run -78dB and 70dB, respectively, with full scale inputs up to 100kHz. The ADS117 requires 15V and +5V power supplies and typically consumes 1.6 Watts. Models are available for use in either commercial (0 to +70C) or military (-55 to +125C) operating temperature ranges.
PIN 1 2 3 4 5 6 7 8 9 10 11 12
INPUT/OUTPUT CONNECTIONS
FUNCTION BIT 12 (LSB) BIT 11 BIT 10 BIT 9 BIT 8 BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 (MSB) PIN 24 23 22 21 20 19 18 17 16 15 14 13 FUNCTION -15V SUPPLY ANALOG GROUND +15V SUPPLY +10V REFERENCE BIPOLAR ANALOG INPUT COMP BIN ENABLE (1-12) START CONVERT EOC DIGITAL GROUND +5V SUPPLY
17 ENABLE (1-12) DAC
12 BIT 1 (MSB) +10V REF. 21 S2 S/H S1 BIPOLAR 20 BUFFER FLASH ADC REF 11 BIT 2
DIGITAL CORRECTION LOGIC
3-STATE OUTPUT REGISTER
10 BIT 3 9 8 7 6 5 4 3 2 1 BIT 4 BIT 5 BIT 6 BIT 7 BIT 8 BIT 9 BIT 10 BIT 11 BIT 12 (LSB)
ANALOG INPUT 19
- +
COMP BIN 18 START CONVERT 16 EOC 15 TIMING AND CONTROL LOGIC
13 +5V SUPPLY
14 DIGITAL GROUND
22 +15V SUPPLY
REGISTER
23 ANALOG GROUND
REGISTER
24 -15V SUPPLY
Figure 1. ADS-117 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 +15V Supply (Pin 22) -15V Supply (Pin 24) +5V Supply (Pin 13) Digital Inputs (Pin 16, 17, 18) Analog Input (Pin 19) Lead Temp. (10 seconds) LIMITS 0 to +16 0 to -16 0 to +6.0 -0.3 to +VDD +0.3 -9 to +15 +300 UNITS Volts Volts Volts Volts Volts C DYNAMIC PERF. (cont) SNR (wo/distortion, -0.5dB) dc to 100kHz 0C to +70C -55C to +125C 100kHz to 500kHz 0C to +70C -55C to +125C 500kHz to 1MHz 0C to +70C -55C to +125C SNR (and distort., -0.5dB) dc to 100kHz 0C to +70C -55C to +125C 100kHz to 500kHz 0C to +70C -55C to +125C 500kHz to 1MHz 0C to +70C -55C to +125C Two-tone Intermodulation Distortion (fin = 970kHz, 990kHz, fs = 2Mhz, -0.5dB) Slew Rate Effect. Aperture Delay Time Overvoltage Recovery Time; 20% S/H Acq. Time, (to 0.01%) 0 to +70C -55C to +125C Conversion Rate OUTPUTS 3 4 0.95 +1.5 0.44 0.73 0.38 0.73 0.38 0.73 0.38 0.73 +10.03 +10.05 1.5 LSB LSB LSB LSB %FSR %FSR %FSR %FSR %FSR %FSR % % Volts Volts mA Output Coding Pin 18 High Pin 18 Low Logic Level Logic "1" Logic "0" Logic Loading "1" Logic Loading "0" POWER REQUIREMENTS Power Supply Ranges +15V Supply -15V Supply +5V Supply Power Supply Current +15V Supply -15V Supply +5V Supply Power Dissipation Power Supply Rejection PHYSICAL/ENVIRONMENTAL Operating Temp. Range, Case ADS-117MC ADS-117MM, 883 Storage Temperature Range Thermal Impedance jc ca Package Type Weight Effective bits is equal to:
(SNR + Distortion) - 1.76 + 20 log 6.02
MIN.
TYP.
MAX.
UNITS
-- -- 65 65 -- -- -- -- 64 62 -- --
72 72 70 70 70 70 70 69 70 69 69 69
-- -- -- -- -- -- -- -- -- -- -- --
dB dB dB dB dB dB dB dB dB dB dB dB
FUNCTIONAL SPECIFICATIONS
(TA = +25C, VCC = +15V, +VDD =+5V, 2MHz sampling rate, and a minimum 3 minute warmup unless otherwise specified.) ANALOG INPUTS Input Voltage Range Bipolar Unipolar Input Impedence Input Capacitance DIGITAL INPUTS Logic Levels Logic "1" Logic "0" Logic Loading "1" Logic Loading "0" PERFORMANCE Resolution No Missing Codes (12 Bits; fin = 1MHz) Integral Non-Linearity 0C to +70C -55C to +125C Differential Non-Linearity 0C to +70C -55C to +125C Full Scale Absolute Accuracy (see Tech Note 1) 0C to +70C -55C to +125C Unipolar/Bipolar Zero Error 0C to +70C (see Tech Note 1) -55C to +125C Bipolar Offset Error 0C to +70C (see Tech Note 1) -55C to +125C Gain Error (see Tech Note 1) 0C to +70C -55C to +125C Internal Reference Voltage 0C to +70C -55C to +125C External Current DYNAMIC PERFORMANCE Spurious Free Dynamic Range (-0.5dB) dc to 100kHz 100kHz to 500kHz 500kHz to 1MHz Total Harm. Distort. (-0.5dB) dc to 100kHz 100kHz to 500kHz 500kHz to 1MHz Input Bandwith (-3dB) Small Signal (-20dB input) Large Signal (-0.5dB input) Feedthrough (1MHz) See Table 1 also Same specifications for in-band harmonics. 12 Bits 0 to +70C -- -- -- -- -- -- -- -- -- -- -- -- +9.97 +9.95 -- 1/2 1 1/2 1 0.13 0.25 0.07 0.22 0.1 0.53 0.1 0.53 +10.0 -- -- +2.0 -- -- -- -- -- -- -- -- +0.8 +5 -600 Volts Volts A A MIN. -- -- 4.5 -- TYP. 5 0 to +10 5 6 MAX. -- -- -- 15 UNITS Volts Volts k pF
-- -- -- -- -- -- 2
-68 210 -- -- 155 160 --
-- -- 16 500 165 170 --
dB V/s ns ns ns ns MHz
Staight binary/Offset binary Complementary binary Complementary offset binary +2.4 -- -- -- -- -- -- -- -- +0.4 -160 +6.4 Volts Volts A mA
+14.25 -14.25 +4.75 -- -- -- -- --
+15.0 -15.0 +5.0 +48 -35 +75 1.6 --
+15.75 -15.75 +5.25 +58 -45 +85 1.9 0.07
Volts Volts Volts mA mA mA Watts %FSR%V
-- -- -- -- -- -- 8 7 -72
-81 -75 -70 -78 -73 -71 10 9 -74
-- -70 -- -- -68 -- -- -- --
dB dB dB dB dB dB MHz MHz dB
0 -55 -65
-- -- --
+70 +125 +150
C C C
-- 3 -- C/W -- 23 -- C/W 24-pin, metal-sealed, ceramic DDIP 0.42 ounces (12 grams)
Full Scale Amplitude Actual Input Amplitude
For 12V, +5V operation, contact DATEL
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TECHNICAL NOTES
1. Applications which are unaffected by endpoint errors or remove them through software will use the typical connections shown in Figure 3. Remove system errors or adjust the small initial errors of the ADS-117 to zero using the optional external circuitry shown in Figure 4. The external adjustment circuit has no effect on the throughput rate. 2. Always connect the analog and digital grounds to a ground plane beneath the converter for best performance. The analog and digital grounds are not connected to each other internally. 3. Bypass the analog and digital supplies and the +10V reference (pin 21) to ground with 4.7F, 25V tantalum electrolytic capacitors in parallel with 0.1F ceramic capacitors. Bypass the +10V reference (pin 21) to ANALOG GROUND (pin 23). 4. Obtain straight binary/offset binary output coding by tying COMP BIN (pin 18) to +5V or leaving it open. The device has an internal pull-up resistor on this pin. To obtain complementary binary or complementary offset binary output coding, tie pin 18 to ground. The pin 18 signal is compatible with CMOS/TTL logic levels for those users desiring dynamic control of this function. Do not change COMP BIN status while EOC is high. 5. To enable the three-state outputs, connect ENABLE (pin 17) to a logic "0" (low). To disable, connect pin 17 to a logic "1" (high). 6. To meet the guaranteed conversion rate, a maximum start convert pulse is specified. A wider start convert pulse will result in slower conversion rates. An initial start convert pulse is required before performing an actual conversion after power-up to assure the sample-hold is in the acquisition mode. Figure 2 shows the relationship between the various input signals. The timing shown applies over the operating temperature range and over the operating power supply range. 7. Re-initiating the START CONVERT (pin 16) while EOC is a logic "1" (high) will result in a new conversion sequence.
N START CONVERT 50ns typ., 30ns min., 60ns max. 10ns min. 25ns max. INTERNAL S/H Hold 10ns min. 17ns max. EOC Conversion Time 325ns typ. Acquisition Time 165ns typ. 170ns max.
N+1
60ns max.
35ns max. OUTPUT DATA DATA N-1 VALID 350ns min. INVALID DATA 150ns max. DATA N VALID INVALID DATA
Note: Scale is approximately 25ns per division.
Figure 2. ADS-117 Timing Diagram
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CALIBRATION PROCEDURE
1. Connect the converter per Figure 3, Figure 4, and Table 1 for the appropriate input range. Apply a pulse of 150 nanoseconds to the START CONVERT input (pin 16) at a rate of 250kHz. This rate is chosen to reduce flicker if LED's are used on the outputs for calibration purposes. 2. Zero Adjustments Apply a precision voltage reference source between the amplifier's analog input and ground. Adjust the output of the reference source per Table 2. For unipolar, adjust the zero trimming potentiometer so that the output code flickers equally between 0000 0000 0000 and 0000 0000 0001 with the pin 18 tied high (straight binary) or between 1111 1111 1111 and 1111 1111 1110 with the pin 18 tied low (complementary binary). For bipolar operation, adjust the potentiometer such that the code flickers equally between 1000 0000 0000 and 1000 0000 0001 with pin 18 tied high (offset binary) or between 0111 1111 1111 and 0111 1111 1110 with pin 18 tied low (complementary offset binary). 3. Full-Scale Adjustment Set the output of the voltage reference used in step 2 to the value shown in Table 1. Adjust the gain trimming potentiometer so that the output code flickers equally between 1111 1111 1110 and 1111 1111 1111 for pin 18 tied high or between 0000 0000 0001 and 0000 0000 0000 for pin 18 tied low. 4. To confirm proper operation of the device, vary the precision reference voltage source to obtain the output coding listed in Table 3.
R1 SIGNAL INPUT R2
+15V
5k 50 GAIN ADJUST 5k 10k ZERO/ OFFSET ADJUST -15V
To Pin19 of ADS-117
For values of R1 and R2 refer to Table 1.
Figure 4. Optional Calibration Circuit Table 1. Input Connections (using external calibration)
INPUT RANGE 0 +10V, 5 0 to 5V, 2.5V 0 to +2.5V, 1.25V
R1 2 2 2
R2 2 6 14
UNIT k k k
Table 2. Zero and Gain Adjustments
Input Range 0 to +10V 5V
Zero Adjust +1/2 LSB +1.22mV +1.22mV
Gain Adjust +FS - 1 1/2 LSB +9.9963V +4.9963V
UNIPOLAR OPERATION 20 BIPOLAR INPUT 21 +10V REF. + 0.1F 4.7F
12 BIT 1 (MSB) 11 BIT 2 10 BIT 3 9 BIT 4 8 BIT 5 7 BIT 6 6 5 4 3 2 1 15 17 BIT 7 BIT 8 BIT 9 BIT 10 BIT 11 BIT 12 (LSB) EOC ENABLE (1-12)
-15V 4.7F + 4.7F +15V +5V 4.7F + 0.1F 0.1F
24 ADS-117 23
22 13
16 START CONVERT 19 ANALOG INPUT
+ 0.1F 14 COMP BIN 18
+5V
NOTE: For unipolar operation, ground pin 20. For bipolar operation, connect pin 20 to pin 21. Always bypass pin 21 as shown for both unipolar and bipolar operation.
Figure 3. ADS-117 Connection Diagram
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Table 3. Output Coding STRAIGHT BIN. UNIPOLAR SCALE INPUT RANGE 0 to +10V COMP. BINARY LSB INPUT RANGE 5V BIPOLAR SCALE
OUTPUT CODING MSB LSB MSB
+FS - 1 LSB +7/8 FS +3/4 FS +1/2 FS +1/4 FS +1/8 FS +1 LSB 0
+9.9976 +8.7500 +7.5000 +5.0000 +2.5000 +1.2500 +0.0024 0.0000
1111 1110 1100 1000 0100 0010 0000 0000
1111 0000 0000 0000 0000 0000 0000 0000
1111 0000 0000 0000 0000 0000 0001 0000
0000 0001 0011 0111 1011 1101 1111 1111
0000 1111 1111 1111 1111 1111 1111 1111
0000 1111 1111 1111 1111 1111 1110 1111
+4.9976 +3.7500 +2.5000 0.0000 -2.5000 -3.7500 -4.9976 -5.0000
+FS -1 LSB +3/4FS +1/2FS 0 -1/2FS -3/4FS -FS+1LSB -FS
OFF. BINARY
COMP. OFF. BIN.
0 -10
Amplitude Relative to Full Scale (dB)
-20 -30 -40 -50 -60 -70 -80 -90 -100 -110 -120 -130 -140 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
Frequency (MHz) (fs = 2MHz, fin = 980kHz, Vin = -0.5dB, 4,096-point FFT)
Figure 5. FFT Analysis of ADS-117
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MECHANICAL DIMENSIONS INCHES (mm)
1.31 MAX. (33.27) Dimension Tolerances (unless otherwise indicated): 2 place decimal (.XX) 0.010 (0.254) 3 place decimal (.XXX) 0.005 (0.127) 0.80 MAX. (20.32) 1 12 Lead Material: Kovar alloy Lead Finish: 50 microinches (minimum) gold plating over 100 microinches (nominal) nickel plating
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0.100 TYP. (2.540) 1.100 (27.940) 0.235 MAX. (5.969) PIN 1 INDEX
0.200 MAX. (5.080)
0.010 (0.254) 0.190 MAX. (4.826) 0.018 0.002 (0.457) 0.100 (2.540) 0.040 (1.016)
+0.002 -0.001
SEATING PLANE 0.025 (0.635)
0.600 0.010 (15.240)
0.100 (2.540)
ORDERING INFORMATION
MODEL NUMBER ADS-117MC ADS-117MM ADS-117/883 OPERATING TEMP. RANGE 0 to +70C -55 to +125C -55 to +125C ACCESSORIES ADS-EVAL1 HS-24 Evaluation Board (without ADS-117) Heat Sink for all ADS-117 models
For MIL-STD-883 product specification or availability of surface-mount packaging, contact DATEL. Receptacles for PC mounting can be ordered through AMP Inc., Part # 3-331272-8 (Component Lead Socket), 24 required.
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ISO 9001
REGISTERED
DS-0230F
07/04
DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 Tel: (508) 339-3000 (800) 233-2765 Fax: (508) 339-6356 Internet: www.datel.com E-mail:sales@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 China, Shanghai, China Tel:011-86-51317199
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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