ADS-117

ADS-117
12-Bit, 2MHz, Low-Power Sampling A/D Converters
PRODUCT OVERVIEW
DATEL's ADS-117 is a functionally complete,
12-bit, 2MHz, sampling A/D converter. Its standard, 24-pin, double-width DIP contains a fastsettling 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.
FEATURES
„ 12-bit resolution
Total harmonic distortion (THD) and signalto-noise ratio (including distortion) typically run
–78dB and 70dB, respectively, with full scale
inputs up to 100kHz. The ADS-117 requires ±15V
and +5V power supplies and typically consumes
1.6 Watts. Models are available for use in either
commercial (0 to +70°C) or military (–55 to
+125°C) operating temperature ranges and
extended commerical (–40 to +85°C).
INPUT/OUTPUT CONNECTIONS
PIN FUNCTION
PIN
FUNCTION
1
BIT 12 (LSB)
24
–15V Supply
2
BIT 11
23
ANALOG GROUND
„ 2MHz minimum throughput
3
BIT 10
22
+15V SUPPLY
„ Functionally complete
4
BIT 9
21
+10V REFERENCE
5
BIT 8
20
BIPOLAR
6
BIT 7
19
ANALOG INPUT
7
BIT 6
18
COMP BIN
8
BIT 5
17
ENABLE (1-12)
9
BIT 4
16
START CONVERT
10
BIT 3
15
EOC
11
BIT 2
14
DIGITAL GROUND
12
BIT 1 (MSB)
13
+5V SUPPLY
„ No missing codes
„ Small 24-pin DDIP
„ Low-power, 1.6 Watts
„ Three-state output buffers
„ Samples to Nyquist frequencies
BLOCK DIAGRAM
17 ENABLE (1-12)
DAC
12 BIT 1 (MSB)
REF
11 BIT 2
FLASH
ADC
S/H
S1
BUFFER
ANALOG INPUT 19
REGISTER
BIPOLAR 20
–
+
3-STATE OUTPUT REGISTER
REGISTER
S2
DIGITAL CORRECTION LOGIC
+10V REF. 21
10 BIT 3
9
BIT 4
8
BIT 5
7
BIT 6
6
BIT 7
5
BIT 8
4
BIT 9
3
BIT 10
2
BIT 11
1
BIT 12 (LSB)
COMP BIN 18
START CONVERT 16
TIMING AND
CONTROL LOGIC
EOC 15
13
14
22
23
24
+5V SUPPLY
DIGITAL GROUND
+15V SUPPLY
ANALOG GROUND
–15V SUPPLY
Figure 1. ADS-117 Functional Block Diagram
DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 USA
• Tel: (508) 339-3000
•
www.datel.com
•
e-mail: help@datel.com
25 Jun 2015
MDA_ADS-117.C01 Page 1 of 7
ADS-117
12-Bit, 2MHz, Low-Power Sampling A/D Converters
ABSOLUTE MAXIMUM RATINGS
LIMITS
0 to +16
0 to –16
0 to +6.0
–0.3 to +VDD +0.3
–9 to +15
+300
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)
UNITS
Volts
Volts
Volts
Volts
Volts
°C
FUNCTIONAL SPECIFICATIONS
(TA = +25°C, ±VCC = +15V, +VDD =+5V, 2MHz sampling rate, and a minimum 3 minute
warmup unless otherwise specified.)
ANALOG INPUTS
Input Voltage Range ➀
Bipolar
Unipolar
Input Impedence
Input Capacitance
MIN.
TYP.
—
—
4.5
—
±5
0 to +10
5
6
MAX.
—
—
—
15
UNITS
Volts
Volts
kΩ
pF
DIGITAL INPUTS
Logic Levels
Logic "1"
Logic "0"
Logic Loading "1"
Logic Loading "0"
+2.0
—
—
—
Resolution
No Missing Codes
(12 Bits; fin = 1MHz)
Integral Non-Linearity
0 to +70°C
–55 to +125°C
Differential Non-Linearity
0 to +70°C
–55 to +125°C / –45 to +85°C
Full Scale Absolute Accuracy
(see Tech Note 1)
0 to +70°C
–55 to +125°C / –45 to +85°C
Unipolar/Bipolar Zero Error
0 to +70°C (see Tech Note 1)
–55 to +125°C / –45 to +85°C
Bipolar Offset Error
0 to +70°C (see Tech Note 1)
–55 to +125°C / –45 to +85°C
Gain Error (see Tech Note 1)
0 to +70°C
–55 to +125°C / –45 to +85°C
Internal Reference Voltage
0 to +70°C
–55 to +125°C / –45 to +85°C
External Current
—
—
—
—
—
+0.8
+5
–600
Volts
Volts
μA
μA
PERFORMANCE
12 Bits
0 to +70°C
—
—
±1/2
±1
±3
±4
LSB
LSB
—
—
±1/2
±1
±0.95
+1.5
LSB
LSB
—
—
±0.13
±0.25
±0.44
±0.73
%FSR
%FSR
—
—
±0.07
±0.22
±0.38
±0.73
%FSR
%FSR
—
—
±0.1
±0.53
±0.38
±0.73
%FSR
%FSR
—
—
±0.1
±0.53
±0.38
±0.73
%
%
+9.97
+9.95
—
+10.0
—
—
+10.03
+10.05
1.5
Volts
Volts
mA
–81
–75
–70
—
–70
—
dB
dB
dB
–78
–73
–71
—
–68
—
dB
dB
dB
DYNAMIC PERFORMANCE
Spurious Free Dynamic Range (–0.5dB) ➁
dc to 100kHz
—
100kHz to 500kHz
—
500kHz to 1MHz
—
Total Harm. Distort. (–0.5dB)
dc to 100kHz
—
100kHz to 500kHz
—
500kHz to 1MHz
—
➀ See Table 1 also
➁ Same specifications for in-band harmonics.
DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 USA
DYNAMIC PERF. (cont)
Input Bandwith (–3dB)
Small Signal (–20dB input)
Large Signal (–0.5dB input)
Feedthrough (1MHz)
SNR (wo/distortion, –0.5dB)
dc to 100kHz
0 to +70°C
–55 to +125°C / –45 to +85°C
100kHz to 500kHz
0 to +70°C
–55 to +125°C / –45 to +85°C
500kHz to 1MHz
0 to +70°C
–55 to +125°C / –45 to +85°C
SNR (and distort., –0.5dB) ➂
dc to 100kHz
0 to +70°C
–55 to +125°C / –45 to +85°C
100kHz to 500kHz
0 to +70°C
–55 to +125°C / –45 to +85°C
500kHz to 1MHz
0 to +70°C
–55 to +125°C / –45 to +85°C
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 +70°C
–55 to +125°C / –45 to +85°C
Conversion Rate
MIN.
TYP.
MAX.
UNITS
8
7
–72
10
9
–74
—
—
—
MHz
MHz
dB
—
—
72
72
—
—
dB
dB
65
65
70
70
—
—
dB
dB
—
—
70
70
—
—
dB
dB
—
—
70
69
—
—
dB
dB
64
62
70
69
—
—
dB
dB
—
—
69
69
—
—
dB
dB
—
—
—
—
–68
±210
—
—
—
—
16
500
dB
V/μs
ns
ns
—
—
2
155
165
—
165
190
—
ns
ns
MHz
OUTPUTS
Staight binary/Offset binary
Complementary binary
Complementary offset binary
Output Coding
Pin 18 High
Pin 18 Low
Logic Level
Logic "1"
Logic "0"
Logic Loading "1"
Logic Loading "0"
+2.4
—
—
—
—
—
—
—
—
+0.4
–160
+6.4
Volts
Volts
μA
mA
POWER REQUIREMENTS
Power Supply Ranges ➃
+15V Supply
–15V Supply
+5V Supply
Power Supply Current
+15V Supply
–15V Supply
+5V Supply
Power Dissipation
Power Supply Rejection
+14.25
–14.25
+4.75
+15.0
–15.0
+5.0
+15.75
–15.75
+5.25
Volts
Volts
Volts
—
—
—
—
—
+48
–35
+75
1.6
—
+64
–50
+95
2.0
±0.07
mA
mA
mA
Watts
%FSR%V
➂ Effective bits is equal to:
(SNR + Distortion) – 1.76 + 20 log
Full Scale Amplitude
Actual Input Amplitude
6.02
➃ For ±12V, +5V operation, contact DATEL.
• Tel: (508) 339-3000
•
www.datel.com
•
e-mail: help@datel.com
25 Jun 2015
MDA_ADS-117.C01 Page 2 of 7
ADS-117
12-Bit, 2MHz, Low-Power Sampling A/D Converters
FUNCTIONAL SPECIFICATIONS. CONT.
PHYSICAL/ENVIRONMENTAL
Operating Temp. Range, Case
ADS-117MC
ADS-117ME
ADS-117MM, 883
Storage Temperature Range
Thermal Impedance
θjc
θca
Package Type
Weight
0
–45
–55
–65
—
—
—
—
+70
+85
+125
+150
°C
°C
°C
°C
—
3
—
°C/W
—
23
—
°C/W
24-pin, metal-sealed, ceramic DDIP
0.42 ounces (12 grams)
TECHNICAL NOTES
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.
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.
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).
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.
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.
3. Bypass the analog and digital supplies and the +10V reference (pin 21)
to ground with 4.7μF, 25V tantalum electrolytic capacitors in parallel
with 0.1μF ceramic capacitors. Bypass the +10V reference (pin 21) to
ANALOG GROUND (pin 23).
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.
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
7. Re-initiating the START CONVERT (pin 16) while EOC is a logic "1" (high)
will result in a new conversion sequence.
N
N+1
START
CONVERT
50ns typ.,
30ns min., 60ns max.
10ns min.
25ns max.
Acquisition Time
INTERNAL S/H
165ns typ.
170ns max.
Hold
10ns min.
17ns max.
EOC
60ns max.
Conversion Time
325ns typ.
35ns max.
OUTPUT
DATA
DATA N-1 VALID
350ns min.
DATA N VALID
INVALID
DATA
150ns max.
INVALID
DATA
Note: Scale is approximately 25ns per division.
Figure 2. ADS-117 Timing Diagram
DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 USA
• Tel: (508) 339-3000
•
www.datel.com
•
e-mail: help@datel.com
25 Jun 2015
MDA_ADS-117.C01 Page 3 of 7
ADS-117
12-Bit, 2MHz, Low-Power Sampling A/D Converters
R2 ➀
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.
+15V
➀
R1
SIGNAL
INPUT
To Pin19
of ADS-117
5kΩ
2. Zero Adjustments
50Ω
GAIN
ADJUST
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).
5kΩ
10kΩ
ZERO/
OFFSET
ADJUST
➀ For values of R1 and R2 refer to Table 1.
Figure 4. Optional Calibration Circuit
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).
Table 1. Input Connections (using external calibration)
3. Full-Scale Adjustment
INPUT RANGE
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.
2
2
kΩ
6
kΩ
0 to +2.5V, ±1.25V
2
14
kΩ
Table 2. Zero and Gain Adjustments
INPUT RANGE
ZERO ADJUST
+1/2 LSB
GAIN ADJUST
RANGE
0 to +10V
+1.22mV
+9.9963V
±5V
+1.22mV
+4.9963V
20 BIPOLAR INPUT
12 BIT 1 (MSB)
11 BIT 2
21 +10V REF.
10 BIT 3
9 BIT 4
8
7
6
5
4.7µF
24
0.1µF
BIT 9
BIT 10
BIT 11
BIT 12 (LSB)
15 EOC
17 ENABLE (1-12)
+
0.1µF
23
4.7µF
+15V
22
16 START CONVERT
13
+5V
+
4.7µF
BIT 5
BIT 6
BIT 7
BIT 8
4
3
2
1
ADS-117
+
UNIT
2
+
4.7µF
R2
0 +10V, ±5
UNIPOLAR
OPERATION
–15V
R1
0 to 5V, ±2.5V
4. To confirm proper operation of the device, vary the precision reference
voltage source to obtain the output coding listed in Table 3.
0.1µF
–15V
19 ANALOG INPUT
0.1µF
COMP BIN 18
14
+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
DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 USA
• Tel: (508) 339-3000
•
www.datel.com
•
e-mail: help@datel.com
25 Jun 2015
MDA_ADS-117.C01 Page 4 of 7
ADS-117
12-Bit, 2MHz, Low-Power Sampling A/D Converters
Table 3. Output Coding
STRAIGHT BIN.
COMP. BINARY
OUTPUT CODING
UNIPOLAR
SCALE
INPUT RANGE
0 to +10V
MSB
LSB
+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
LSB
INPUT RANGE
±5V
BIPOLAR
SCALE
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
MSB
1111
0000
0000
0000
0000
0000
0001
0000
OFF. BINARY
0000
0001
0011
0111
1011
1101
1111
1111
0000
1111
1111
1111
1111
1111
1111
1111
COMP. OFF. BIN.
0
Amplitude Relative to Full Scale (dB)
–10
–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
DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 USA
• Tel: (508) 339-3000
•
www.datel.com
•
e-mail: help@datel.com
25 Jun 2015
MDA_ADS-117.C01 Page 5 of 7
ADS-117
12-Bit, 2MHz, Low-Power Sampling A/D Converters
MECHANICAL DIMENSIONS INCHES (mm)
1.31 MAX.
(33.27)
TDIP PACKAGE
24
Dimension Tolerances (unless otherwise indicated):
2 place decimal (.XX) ±0.010 (±0.254)
3 place decimal (.XXX) ±0.005 (±0.127)
13
0.80 MAX.
(20.32)
1
Lead Material: Kovar alloy
Lead Finish: 50 microinches (minimum) gold plating
over 100 microinches (nominal) nickel plating
12
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)
0.100
(2.540)
1.31 MAX.
(33.02)
SMT PACKAGE
Dimension Tolerances (unless otherwise indicated):
2 place decimal (.XX) ±0.010 (±0.254)
3 place decimal (.XXX) ±0.005 (±0.127)
13
24
0.80 MAX.
(20.32)
1
0.190 MAX.
(4.826)
0.100
(2.540)
0.600 ±0.010
(15.240)
SEATING
PLANE
0.025
(0.635)
0.040
(1.016)
0.018 ±0.002
(0.457)
+0.002
–0.001
Lead Material: Kovar alloy
Lead Finish: 50 microinches (minimum) gold plating
over 100 microinches (nominal) nickel plating
12
0.020 TYP.
(0.508)
0.060 TYP.
(1.524)
0.130 TYP.
(3.302)
PIN 1
INDEX
0.100
(2.540)
0.100 TYP.
(2.540)
0.015
(0.381)
MAX. radius
for any pin
0.020
(0.508)
0.010 TYP.
(0.254)
0.040
(1.016)
DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 USA
• Tel: (508) 339-3000
•
www.datel.com
•
e-mail: help@datel.com
25 Jun 2015
MDA_ADS-117.C01 Page 6 of 7
ADS-117
12-Bit, 2MHz, Low-Power Sampling A/D Converters
ORDERING GUIDE
MODEL NUMBER
ADS-117MC
ADS-117MC-C
ADS-117ME
ADS-117ME-C
ADS-117MM
ADS-117MM-C
ADS-117/883
ADS-117-C/883
ADS-117GC
ADS-117GC-C
ADS-117GE
ADS-117GE-C
ADS-117GM
ADS-117GM-C
ADS-117G/883
ADS-117G-C/883
DATEL is a registered trademark of DATEL, Inc.
11 Cabot Boulevard, Mansfield, MA 02048-1151 USA
OPERATING
TEMPERATURE RANGE
0 to +70°C
0 to +70°C
-40to +100°C
-40to +100°C
-55to +125°C
-55to +125°C
-55to +125°C
-55to +125°C
0 to +70°C
0 to +70°C
-40to +100°C
-40to +100°C
-55to +125°C
-55to +125°C
-55to +125°C
-55to +125°C
PACKAGE
ROHS
TDIP
TDIP
TDIP
TDIP
TDIP
TDIP
TDIP
TDIP
SMT
SMT
SMT
SMT
SMT
SMT
SMT
SMT
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
DATEL, Inc. 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.
ITAR and ISO 9001/14001 REGISTERED
© 2015 DATEL, Inc.
www.datel.com • e-mail: help@datel.com
25 Jun 2015
MDA_ADS-117.C01 Page 7 of 7