Murata ADS-112MM 12-bit, 1mhz, low-power sampling a/d converter Datasheet

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ADS-112
12-Bit, 1MHz, Low-Power Sampling A/D Converters
PRODUCT OVERVIEW
DATEL’s ADS-112 is a 12-bit, functionally complete, sampling A/D converter that is packaged in
a space-saving 24-pin DDIP. Requiring ±15V and
+5V supplies, a minimum sampling rate of 1MHz
is achieved while only dissipating 1.3 Watts. The
ADS-112 digitizes signals up to Nyquist frequencies. Models are available for use in either commercial (0 to + 70°C) or military (–55 to +125°C)
operating temperature ranges.
Typical applications include spectrum, transient, vibration and waveform analysis. This device
is also ideally suited for radar, sonar, video digitization, medical instrumentation and highspeed data
acquisition systems.
FEATURES
■
12-bit resolution
■
No missing codes
■
1MHz minimum sampling rate
■
Functionally complete
■
Small 24-pin DDIP
■
Low-power, 1.3 Watts
■
Three-state output buffers
■
Samples to Nyquist frequencies
INPUT/OUTPUT CONNECTIONS
PIN
FUNCTION
PIN
FUNCTION
1
BIT 12 (LSB)
24
–15V SUPPLY
2
BIT 11
23
ANALOG GROUND
3
BIT 10
22
+15V SUPPLY
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)
START CONVERT
9
BIT 4
16
10
BIT 3
15
EOC
11
BIT 2
14
DIGITAL GROUND
12
BIT 1 (MSB)
13
+5V SUPPLY
17 ENABLE (1-12)
DAC
12 BIT 1 (MSB)
REF
S/H
S1
BUFFER
ANALOG INPUT 19
REGISTER
BIPOLAR 20
–
+
3-STATE OUTPUT REGISTER
FLASH
ADC
DIGITAL CORRECTION LOGIC
S2
11 BIT 2
REGISTER
+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
TIMING AND
CONTROL LOGIC
START CONVERT 16
EOC 15
13
14
22
23
24
+5V SUPPLY
DIGITAL GROUND
+15V SUPPLY
ANALOG GROUND
–15V SUPPLY
Figure 1. ADS-112 Functional Block Diagram
For full details go to
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MDA_ADS-112.B01 Page 1 of 6
ADS-112
12-Bit, 1MHz, Low-Power Sampling A/D Converters
ABSOLUTE MAXIMUM RATINGS
DYNAMIC PERFORMANCE, CONT.
PARAMETERS
LIMITS
UNITS
+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)
0 to +18
0 to –18
0 to +6
–0.3 to +VDD +0.3
–9 to +15
+300
Volts
Volts
Volts
Volts
Volts
°C
Functional Specifications
(TA = +25°C, ±VCC = ±15V, +VDD =+5V, 1MHz sampling rate, and a minimum 1 minute
warmup unless otherwise specified.)
ANALOG INPUTS
Input Voltage Range ➀
Bipolar
Unipolar
Input Impedence
Input Capacitance
MIN.
TYP.
MAX.
UNITS
—
—
4.5
—
±5
0 to +10
5
6
—
—
—
15
Volts
Volts
kW
pF
—
—
—
—
—
+0.8
+10
-600
Volts
Volts
μA
μA
DIGITAL INPUTS
Logic Levels
Logic "1"
Logic "0"
Logic Loading "1"
Logic Loading "0"
+2.0
—
—
—
PERFORMANCE
Resolution
No Missing Codes
(12 Bits; fin = 1MHz)
12 Bits
Over the operating temperature range
—
—
—
±1/4
±1/4
±1/2
±3/4
±3/4
±1.5
LSB
LSB
LSB
Differential Non-Linearity
+25°C
0°C to +70°C
–55°C to +125°C
—
—
—
±1/4
±1/4
±1/2
±3/4
±3/4
±1
LSB
LSB
LSB
Full Scale Absolute Accuracy
+25°C
0°C to +70°C
–55°C to +125°C
—
—
—
±0.13
±0.15
±0.25
±0.25
±0.44
±0.78
%FSR
%FSR
%FSR
Unipolar Zero Error †
0°C to +70°C
–55°C to +125°C
—
—
±0.074
±0.224
±0.265
±0.43
%FSR
%FSR
Bipolar Zero Error †
0°C to +70°C
–55°C to +125°C
—
—
±0.074
±0.124
±0.166
±0.210
%FSR
%FSR
Bipolar Offset Error †
0°C to +70°C
–55°C to +125°C
—
—
±0.1
±0.3
±0.38
±0.60
%FSR
%FSR
Internal Reference Voltage, +25°C
Drift
External Current
MIN.
TYP.
MAX.
UNITS
68
67
72
71
—
—
dB
dB
66
66
70
70
—
—
dB
dB
—
–88
–80
dB
—
–68
–65
dB
8
6
—
—
—
10
8
±150
—
—
—
—
—
20
16
MHz
MHz
V/μs
ns
ns
—
—
—
160
—
—
—
250
15
±50
1000
280
ps
ps
ns
ns
1
1
1
—
—
—
—
—
—
MHz
MHz
MHz
DIGITAL OUTPUTS
Integral Non-Linearity
+25°C
0°C to +70°C
–55°C to +125°C
Gain Error †
0°C to +70°C
–55°C to +125°C
Signal-to-Noise Ratio
(wo/distort., –0.5dB)
dc to 100kHz
100kHz to 500kHz
Signal-to-Noise Ratio ➁
(& distort., –0.5dB)
dc to 100kHz
100kHz to 500kHz
Two-tone Intermodulation
Distortion (fin = 75kHz,
105kHz, fs = 1MHz, –0.7dB)
Two-tone Intermodulation
Distortion (fin = 480kHz,
490kHz, fs = 1MHz, –0.7dB)
Input Bandwith (–3dB)
Small Signal (–20dB input)
Large Signal (–0.5dB input)
Slew Rate
Apperture Delay TIme
Effect. Aperture Delay Time
Apperture Uncertainity (Jitter)
RMS
Peak
Overvoltage Recovery Time
S/H Acquisition Time
Conversion Rate
(Changing Inputs)
+25°C
0°C to +70°C
–55°C to +125°C
—
—
±0.1
±0.3
±0.38
±0.60
+9.98
—
—
+10.0
±5
—
+10.02
±30
1.5
DYNAMIC PERFORMANCE
In-Band Harmonics (–0.5dB)
dc to 100kHz
—
–81
100kHz to 500kHz
—
–75
Total Harm. Distort. (–0.5dB)
dc to 100kHz
—
–78
100kHz to 500kHz
—
–73
%
%
Volts
ppm/°C
mA
Data Coding
Pin 18 High
Pin 18 Low
Logic Level
Logic "1"
Logic "0"
Logic Loading "1"
Logic Loading "0"
Straight binary/Offset binary
Complementary binary
Complementary offset binary
+2.4
—
—
—
—
—
—
—
—
+0.4
–160
+6.4
Volts
Volts
μA
mA
POWER REQUIREMENTS
Power Supply Ranges ③
+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
—
—
—
—
—
+24
–40
+80
1.3
—
+35
–48
+95
1.7
±0.07
mA
mA
mA
Watts
%FSR%V
PHYSICAL/ENVIRONMENTAL
Operating Temp. Range, Case
ADS-112MC
ADS-112MM, 883
Storage Temperature Range
Package Type
Weight
0
—
+70
°C
–55
—
+125
°C
–65
—
+150
°C
24-pin, metal-sealed, ceramic DDIP
0.42 ounces (12 grams)
➀ See Table 3 also
➁ Effective bits is equal to:
–75
–70
dB
dB
–75
–68
dB
dB
Full Scale Amplitude
(SNR + Distortion) – 1.76 + 20 log
Actual Input Amplitude
6.02
➂ For ±12V, +5V operation, contact DATEL
† See Tech Note 1
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Technical enquiries email: [email protected], tel: +1 508 339 3000
MDA_ADS-112.B01 Page 2 of 6
ADS-112
12-Bit, 1MHz, Low-Power Sampling A/D Converters
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-112 to zero using the optional external circuitry shown in Figure 4. The
external adjustment circuit has no effect on the throughput rate.
2. For best performance, always connect the analog and digital ground pins to a ground plane
beneath the converter. 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 4.7μF,
25V tantalum electrolytic capacitors in parallel with 0.1μF 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.
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. Do not change the status of pin 18 when EOC is high.
7. Re-initiating the START CONVERT (pin 16) while EOC is a logic "1" (high) will result in a new
conversion sequence.
TIMING
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. These times
are guaranteed by design.
N
N+1
START
CONVERT
150ns, ±25ns
10ns min.
20ns max.
Acquisition Time
INTERNAL S/H
250ns
Hold
20ns max.
EOC
60ns max.
Conversion Time
600ns max.
35ns max.
OUTPUT
DATA
DATA N-1 VALID
800ns min.
DATA N VALID
INVALID
DATA
200ns max.
INVALID
DATA
Note: Scale is approximately 50ns per division.
Figure 2. ADS-112 Timing Diagram
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MDA_ADS-112.B01 Page 3 of 6
ADS-112
12-Bit, 1MHz, Low-Power Sampling A/D Converters
CALIBRATION PROCEDURE
R2 ~
1. Connect the converter per Figures 3 and 4 and Tables 1 and 3 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
the flicker if LED’s are used on the outputs for calibration purposes.
+15V
~
R1
SIGNAL
INPUT
2. Zero Adjustments
To Pin19
of ADS-112
5k7
507
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
COMP BIN (pin 18) tied high (straight binary) or between 1111 1111 1111
and 1111 1111 1110 with pin 18 tied low (complementary binary).
–15V
5k7
10k7
ZERO/
OFFSET
ADJUST
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).
~ For values of R1 and R2 refer to Table 3.
Figure 4. Optional Calibration Circuit
3. Full-Scale Adjustment
Table 2. Zero and Gain Adjust
Set the output of the voltage reference used in step 2 to the value shown
in Table 2. 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.
Input Range
To confirm proper operation of the device, vary the precision reference
voltage source to obtain the output coding listed in Table 4.
Zero Adjust
+1/2 LSB
Gain Adjust
+FS – 1 1/2 LSB
0 to +10V
+1.22mV
+9.9963V
±5V
+1.22mV
+4.9963V
Table 3. Input Range (using external calibration)
Table 1. Input Range Selection
Input Range
R1
R2
Unit
Input Range
Input Pin
Tie Together
0 to 10V, ±5
2
2
kW
±5v
Pin 19
Pin 20 to Pin 21
0 to 5V, ±2.5V
2
6
kW
0 to +10V
Pin 19
Pin 20 to Ground
0 to +2.5V, ±1.25V
2
14
kW
BIPOLAR
OPERATION
UNIPOLAR
OPERATION
12 BIT 1 (MSB)
11 BIT 2
20
20
21
21 +10V REF.
10
9
8
7
6
5
4
3
2
1
15
17
+
0.1F
4.7F
24
–15V
4.7F
+
0.1F
+
0.1F
ADS-112
23
4.7F
+15V
22
+
4.7F
0.1F
COMP BIN 18
14
BIT 5
BIT 6
BIT 7
BIT 8
BIT 9
BIT 10
BIT 11
BIT 12 (LSB)
EOC
ENABLE (1-12)
16 START CONVERT
19 ANALOG INPUT
13
+5V
BIT 3
BIT 4
+5V
Note: Always bypass pin 21 to ground
Figure 3. Typical ADS-112 Connection Diagram
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MDA_ADS-112.B01 Page 4 of 6
ADS-112
12-Bit, 1MHz, Low-Power Sampling A/D Converters
Table 4. 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
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
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
COMP. OFF. BIN.
0
Amplitude Relative to Full Scale (dB)
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
–130
0
50
100
150
200
250
300
350
400
450
500
Frequency (kHz)
(fs = 1MHz, fin = 485kHz, Vin = –0.5dB, 4,096-point FFT)
Figure 5. FFT Analysis of ADS-112
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MDA_ADS-112.B01 Page 5 of 6
ADS-112
12-Bit, 1MHz, Low-Power Sampling A/D Converters
MECHANICAL DIMENSIONS INCHES (mm)
1.31 MAX.
(33.27)
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)
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
0.100
(2.540)
ORDERING INFORMATION
MODEL
ADS-112MC
ADS-112MM
ADS-112/883
ACCESSORIES
ADS-EVAL4
HS-32
OPERATING TEMP. RANGE
0 to +70°C
–55 to +125°C
–55 to +125°C
Evaluation Board (without ADS-112)
Heat Sink for all ADS-112 models
Murata Power Solutions, Inc.
11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A.
Tel: (508) 339-3000 (800) 233-2765 Fax: (508) 339-6356
www.murata-ps.com email: [email protected] ISO 9001 and 14001 REGISTERED
03/23/09
Murata Power Solutions, 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.
© 2009 Murata Power Solutions, Inc.
www.murata-ps.com
USA:
Mansfield (MA), Tel: (508) 339-3000, email: [email protected]
Canada:
Toronto, Tel: (866) 740-1232, email: [email protected]
UK:
Milton Keynes, Tel: +44 (0)1908 615232, email: [email protected]
France:
Montigny Le Bretonneux, Tel: +33 (0)1 34 60 01 01, email: [email protected]
Germany:
München, Tel: +49 (0)89-544334-0, email: [email protected]
Japan:
Tokyo, Tel: 3-3779-1031, email: [email protected]
Osaka, Tel: 6-6354-2025, email: [email protected]
China:
Shanghai, Tel: +86 215 027 3678, email: [email protected]
Guangzhou, Tel: +86 208 221 8066, email: [email protected]
Singapore:
Parkway Centre, Tel: +65 6348 9096, email: [email protected]
Technical enquiries email: [email protected], tel: +1 508 339 3000
MDA_ADS-112.B01 Page 6 of 6
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