ADS-112MC - Murata Power Solutions

PRODUCT OVERVIEW

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

DATEL’s ADS-112 is a 12-bit, functionally com-

plete, 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 frequen-

cies. Models are available for use in either com-

mercial (0 to + 70°C) or military (–55 to +125°C)

operating temperature ranges.

Typical applications include spectrum, tran-

sient, vibration and waveform analysis. This device

is also ideally suited for radar, sonar, video digitiza-

tion, medical instrumentation and highspeed data

acquisition systems.

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)

9 BIT 4 16 START CONVERT

10 BIT 3 15 EOC

11 BIT 2 14 DIGITAL GROUND

12 BIT 1 (MSB) 13 +5V SUPPLY

Figure 1. ADS-112 Functional Block Diagram

REF

REGISTERREGISTER

3-STATE OUTPUT REGISTER

12 TIB 1 (MSB)

11 BIT 2

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)

TIMING AND

CONTROL LOGIC

BIPOLAR 20

+10V REF. 21

START CONVERT 16

EOC 15

DIGITAL CORRECTION LOGIC

DAC

FLASH

ADC

COMP BIN 18

BUFFER

–

S/H

ANALOG INPUT 19

17 ENABLE (1-12)

+5V SUPPLY

+15V SUPPLY

ANALOG GROUND

DIGITAL GROUND

–15V SUPPLY

ADS-112

12-Bit, 1MHz, Low-Power Sampling A/D Converters

®®

DATEL • 11 Cabot Boulevard, Mansﬁ eld, MA 02048-1151 USA • Tel: (508) 339-3000 • www.datel.com • e-mail: help@datel.com

31 Mar 2011 MDA_ADS-112.B02 Page 1 of 6

Functional Speciﬁ cations

(TA = +25°C, ±VCC = ±15V, +VDD =+5V, 1MHz sampling rate, and a minimum 1 minute

warmup unless otherwise speciﬁ ed.)

ANALOG INPUTS MIN. TYP. MAX. UNITS

Input Voltage Range ➀

Bipolar — ±5 — Volts

Unipolar — 0 to +10 — Volts

Input Impedence 4.5 5 — kW

Input Capacitance — 6 15 pF

DIGITAL INPUTS

Logic Levels

Logic "1" +2.0 — — Volts

Logic "0" — — +0.8 Volts

Logic Loading "1" — — +10 μA

Logic Loading "0" — — -600 μA

PERFORMANCE

Resolution 12 Bits

No Missing Codes

(12 Bits; ﬁ n = 1MHz) Over the operating temperature range

Integral Non-Linearity

+25°C — ±1/4 ±3/4 LSB

0°C to +70°C — ±1/4 ±3/4 LSB

–55°C to +125°C — ±1/2 ±1.5 LSB

Differential Non-Linearity

+25°C — ±1/4 ±3/4 LSB

0°C to +70°C — ±1/4 ±3/4 LSB

–55°C to +125°C — ±1/2 ±1 LSB

Full Scale Absolute Accuracy

+25°C — ±0.13 ±0.25 %FSR

0°C to +70°C — ±0.15 ±0.44 %FSR

–55°C to +125°C — ±0.25 ±0.78 %FSR

Unipolar Zero Error †

0°C to +70°C — ±0.074 ±0.265 %FSR

–55°C to +125°C — ±0.224 ±0.43 %FSR

Bipolar Zero Error †

0°C to +70°C — ±0.074 ±0.166 %FSR

–55°C to +125°C — ±0.124 ±0.210 %FSR

Bipolar Offset Error †

0°C to +70°C — ±0.1 ±0.38 %FSR

–55°C to +125°C — ±0.3 ±0.60 %FSR

Gain Error †

0°C to +70°C — ±0.1 ±0.38 %

–55°C to +125°C — ±0.3 ±0.60 %

Internal Reference Voltage, +25°C +9.98 +10.0 +10.02 Volts

Drift — ±5 ±30 ppm/°C

External Current — — 1.5 mA

DYNAMIC PERFORMANCE

In-Band Harmonics (–0.5dB)

dc to 100kHz — –81 –75 dB

100kHz to 500kHz — –75 –70 dB

Total Harm. Distort. (–0.5dB)

dc to 100kHz — –78 –75 dB

100kHz to 500kHz — –73 –68 dB

PARAMETERS LIMITS UNITS

+15V Supply (Pin 22) 0 to +18 Volts

–15V Supply (Pin 24) 0 to –18 Volts

+5V Supply (Pin 13) 0 to +6 Volts

Digital Inputs (Pin 16, 17, 18) –0.3 to +VDD +0.3 Volts

Analog Input (Pin 19) –9 to +15 Volts

Lead Temp. (10 seconds) +300 °C

ABSOLUTE MAXIMUM RATINGS

† See Tech Note 1

DYNAMIC PERFORMANCE, CONT. MIN. TYP. MAX. UNITS

Signal-to-Noise Ratio

(wo/distort., –0.5dB)

dc to 100kHz 68 72 — dB

100kHz to 500kHz 67 71 — dB

Signal-to-Noise Ratio ➁

(& distort., –0.5dB)

dc to 100kHz 66 70 — dB

100kHz to 500kHz 66 70 — dB

Two-tone Intermodulation

Distortion (ﬁ n = 75kHz,

105kHz, fs = 1MHz, –0.7dB) — –88 –80 dB

Two-tone Intermodulation

Distortion (ﬁ n = 480kHz,

490kHz, fs = 1MHz, –0.7dB) — –68 –65 dB

Input Bandwith (–3dB)

Small Signal (–20dB input) 8 10 — MHz

Large Signal (–0.5dB input) 6 8 — MHz

Slew Rate — ±150 — V/μs

Apperture Delay TIme — — 20 ns

Effect. Aperture Delay Time — — 16 ns

Apperture Uncertainity (Jitter)

RMS — — 15 ps

Peak — — ±50 ps

Overvoltage Recovery Time — — 1000 ns

S/H Acquisition Time 160 250 280 ns

Conversion Rate

(Changing Inputs)

+25°C 1 — — MHz

0°C to +70°C 1 — — MHz

–55°C to +125°C 1 — — MHz

DIGITAL OUTPUTS

Data Coding Straight binary/Offset binary

Pin 18 High Complementary binary

Pin 18 Low Complementary offset binary

Logic Level

Logic "1" +2.4 — — Volts

Logic "0" — — +0.4 Volts

Logic Loading "1" — — –160 μA

Logic Loading "0" — — +6.4 mA

POWER REQUIREMENTS

Power Supply Ranges ③

+15V Supply +14.25 +15.0 +15.75 Volts

–15V Supply –14.25 –15.0 –15.75 Volts

+5V Supply +4.75 +5.0 +5.25 Volts

Power Supply Current

+15V Supply — +24 +35 mA

–15V Supply — –40 –48 mA

+5V Supply — +80 +95 mA

Power Dissipation — 1.3 1.7 Watts

Power Supply Rejection — — ±0.07 %FSR%V

PHYSICAL/ENVIRONMENTAL

Operating Temp. Range, Case

ADS-112MC 0 — +70 °C

ADS-112MM, 883 –55 — +125 °C

Storage Temperature Range –65 — +150 °C

Package Type 24-pin, metal-sealed, ceramic DDIP

Weight 0.42 ounces (12 grams)

➀ See Table 3 also

➁ Effective bits is equal to:

➂ For ±12V, +5V operation, contact DATEL

6.02

(SNR + Distortion) – 1.76 + 20 log

Full Scale Amplitude

Actual Input Amplitude

ADS-112

12-Bit, 1MHz, Low-Power Sampling A/D Converters

®®

DATEL • 11 Cabot Boulevard, Mansﬁ eld, MA 02048-1151 USA • Tel: (508) 339-3000 • www.datel.com • e-mail: help@datel.com

31 Mar 2011 MDA_ADS-112.B02 Page 2 of 6

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 inter-

nally.

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 compat-

ible 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.

Figure 2. ADS-112 Timing Diagram

START

CONVERT

INTERNAL S/H

NN+1

150ns, ±25ns

Acquisition Time

250ns

10ns min.

20ns max.

EOC

20ns max.

Conversion Time

600ns max.

60ns max.

Note: Scale is approximately 50ns per division.

35ns max.

OUTPUT

DATA DATA N-1 VALID

INVALID

DATA

DATA N VALID

800ns min. INVALID

DATA

200ns max.

Hold

ADS-112

12-Bit, 1MHz, Low-Power Sampling A/D Converters

®®

DATEL • 11 Cabot Boulevard, Mansﬁ eld, MA 02048-1151 USA • Tel: (508) 339-3000 • www.datel.com • e-mail: help@datel.com

31 Mar 2011 MDA_ADS-112.B02 Page 3 of 6

CALIBRATION PROCEDURE

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 ﬂ icker if LED’s are used on the outputs for calibration purposes.

2. Zero Adjustments

Apply a precision voltage reference source between the ampliﬁ er’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 ﬂ ickers 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).

For bipolar operation, adjust the potentiometer such that the code ﬂ ick-

ers 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 2. Adjust the gain trimming potentiometer so that the output

code ﬂ ickers 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.

To conﬁ rm proper operation of the device, vary the precision reference

voltage source to obtain the output coding listed in Table 4.

Table 1. Input Range Selection

Input Range Input Pin Tie Together

±5v Pin 19 Pin 20 to Pin 21

0 to +10V Pin 19 Pin 20 to Ground

Table 2. Zero and Gain Adjust

Input Range 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)

Input Range R1 R2 Unit

0 to 10V, ±5 2 2 kW

0 to 5V, ±2.5V 2 6 kW

0 to +2.5V, ±1.25V 2 14 kW

Figure 4. Optional Calibration Circuit

To Pin19

of ADS-112

–15V

+15V

For values of R1 and R2 refer to Table 3.

5k7

507

10k7

ZERO/

OFFSET

ADJUST

SIGNAL

INPUT

GAIN

ADJUST

5k7

Figure 3. Typical ADS-112 Connection Diagram

0.1F

4.7F

ADS-112

BIT 1 (MSB)

BIT 2

BIT 3

BIT 4

BIT 5

BIT 6

BIT 7

BIT 8

BIT 9

BIT 10

BIT 11

BIT 12 (LSB)

EOC

ENABLE (1-12)

ANALOG INPUT

START CONVERT

+5V

–15V

+15V +

0.1F

4.7F

0.1F

4.7F

COMP BIN

0.1F

4.7F

21 +10V REF.

UNIPOLAR

OPERATION

BIPOLAR

OPERATION

18 +5V

Note: Always bypass pin 21 to ground

ADS-112

12-Bit, 1MHz, Low-Power Sampling A/D Converters

®®

DATEL • 11 Cabot Boulevard, Mansﬁ eld, MA 02048-1151 USA • Tel: (508) 339-3000 • www.datel.com • e-mail: help@datel.com

31 Mar 2011 MDA_ADS-112.B02 Page 4 of 6

Table 4. Output Coding

STRAIGHT BIN. COMP. BINARY

UNIPOLAR

SCALE

INPUT RANGE

0 to +10V

OUTPUT CODING INPUT RANGE

±5V

BIPOLAR

SCALE

MSB LSB MSB LSB

+FS – 1 LSB

+7/8 FS

+3/4 FS

+1/2 FS

+1/4 FS

+1/8 FS

+1 LSB

+9.9976

+8.7500

+7.5000

+5.0000

+2.5000

+1.2500

+0.0024

0.0000

1111

1110

1100

1000

0100

0010

0000

1111

0000

1111

0000

0001

0000

0001

0011

0111

1011

1101

1111

0000

1111

0000

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

–1/2FS

–3/4FS

–FS+1LSB

–FS

OFF. BINARY COMP. OFF. BIN.

Figure 5. FFT Analysis of ADS-112

–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)

Amplitude Relative to Full Scale (dB)

ADS-112

12-Bit, 1MHz, Low-Power Sampling A/D Converters

®®

DATEL • 11 Cabot Boulevard, Mansﬁ eld, MA 02048-1151 USA • Tel: (508) 339-3000 • www.datel.com • e-mail: help@datel.com

31 Mar 2011 MDA_ADS-112.B02 Page 5 of 6

ORDERING INFORMATION

MODEL OPERATING TEMP. RANGE

ADS-112MC 0 to +70°C

ADS-112MM –55 to +125°C

ADS-112/883 –55 to +125°C

ACCESSORIES

ADS-EVAL4 Evaluation Board (without ADS-112)

HS-32 Heat Sink for all ADS-112 models

MECHANICAL DIMENSIONS INCHES (mm)

0.200 MAX.

(5.080)

0.235 MAX.

(5.969)

0.600 ±0.010

(15.240)

0.80 MAX.

(20.32)

0.100 TYP.

(2.540)

0.100

(2.540)

0.018 ±0.002

(0.457)

0.100

(2.540)

0.040

(1.016)

1.31 MAX.

(33.27)

112

1.100

(27.940)

0.190 MAX.

(4.826)

0.010

(0.254)

+0.002

–0.001

SEATING

PLANE

0.025

(0.635)

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

Lead Finish: 50 microinches (minimum) gold plating

over 100 microinches (nominal) nickel plating

PIN 1 INDEX

ADS-112

12-Bit, 1MHz, Low-Power Sampling A/D Converters

. 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. Speciﬁ cations are subject to change

without notice.

www.datel.com • e-mail: help@datel.com

®®

DATEL

11 Cabot Boulevard, Mansﬁ eld, MA 02048-1151 USA

ITAR and ISO 9001/14001 REGISTERED

31 Mar 2011 MDA_ADS-112.B02 Page 6 of 6