DATEL ADS-119 Service Manual

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REGISTERREGISTER

OUTPUT REGISTER

DIGITAL CORRECTION LOGIC

SUPPLY

GROUND

SUPPLY

GROUND

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FEATURES

• 12-bit resolution

• 10MHz minimum sampling rate

• Functionally complete

• Small 24-pin DDIP or SMT package

• Requires only ±5V supplies

• Low-power, 1.8 Watts

• Outstanding dynamic performance

• Edge-triggered

• No missing codes over temperature

• Ideal for both time and frequency-domain applications

GENERAL DESCRIPTION

The ADS-119 is a high-performance, 12-bit, 10MHz sampling
A/D converter. The device samples input signals up to Nyquist
frequencies with no missing codes. The ADS-119 features
excellent dynamic performance including a typical SNR of
69dB.

Packaged in a metal-sealed, ceramic, 24-pin DDIP, the
functionally complete ADS-119 contains a fast-settling sample/
hold amplifier, a subranging (two-pass) A/D converter, a
precise voltage reference, timing/control logic, and error­correction circuitry. All timing and control logic operates from
the rising edge of a single start convert pulse. Digital input and
output levels are TTL.

Requiring only ±5V supplies, the ADS-119 typically dissipates

1.8 Watts. The unit offers a bipolar input range of ±1.5V.
Models are available for use in either commercial (0 to +70°C)
or military (–55 to +125°C) operating temperature ranges.

ADS-119

12-Bit, 10MHz, Low-Power

Sampling A/D Converters

INPUT/OUTPUT CONNECTIONS

PIN FUNCTION PIN FUNCTION

1 BIT 12 (LSB) 24 NO CONNECT
2 BIT 11 23 ANALOG GROUND
3 BIT 10 22 NO CONNECT
4 BIT 9 21 +5V ANALOG SUPPLY
5 BIT 8 20 –5V SUPPLY
6 BIT 7 19 ANALOG INPUT
7 BIT 6 18 ANALOG GROUND
8 BIT 5 17 OFFSET ADJUST

9 BIT 4 16 START CONVERT
10 BIT 3 15 DATA VALID
11 BIT 2 14 DIGITAL GROUND
12 BIT 1 13 +5V DIGITAL SUPPLY

Typical applications include signal analysis, medical/graphic
imaging, process control, ATE, radar, and sonar.

OFFSET ADJUST 17

Σ

AMP

13

+5V DIGITAL

BUFFER

REF

FLASH

ADC

1

DAC

FLASH

ADC

2

14

DIGITAL

20

–5V SUPPLY

12 BIT 1 (MSB)
11 BIT 2
10 BIT 3
9 BIT 4
8 BIT 5
7 BIT 6
6 BIT 7
5 BIT 9
4 BIT 9
3 BIT 10
2 BIT 11
1 BIT 12 (LSB)

18, 23

ANALOG

22, 24

NO CONNECT

ANALOG INPUT 19

START CONVERT 16

DATA VALID 15

21

+5V ANALOG

–

S/H

+

TIMING AND

CONTROL LOGIC

Figure 1. ADS-119 Functional Block Diagram

DATEL, Inc., 11 Cabot Boulevard, Mansfield, MA 02048-1151 (U.S.A.) • Tel: [phone] Fax: [phone] • For immediate assistance: [phone]

ADS-119

® ®

ABSOLUTE MAXIMUM RATINGS

PARAMETERS LIMITS UNITS

+5V Supply (Pin 13, 21) 0 to +6 Volts
–5V Supply (Pin 20) 0 to –6 Volts
Digital Input (Pin 16) –0.3 to +V

DD +0.3 Volts

Analog Input (Pin 19) ±5 Volts
Lead Temp (10 seconds) +300 °C

FUNCTIONAL SPECIFICATIONS

(TA = +25°C, ±VDD = ±5V, 10mHz sampling rate, and a minimum
3 minute warmup ➀ unless otherwise specified.)

PHYSICAL/ENVIRONMENTAL

PARAMETERS MIN. TYP. MAX. UNITS

Operating Temp. Range, Case

ADS-119MC/GC 0 — +70 °C
ADS-119MM/GM/883 –55 — +125 °C

Thermal Impedance

θjc 6 °C/Watt
θca 24 °C/Watt

Storage Temperature –65 — +150 °C
Package Type 24-pin, metal-sealed, ceramic DDIP or SMIT
Weight 0.42 ounces (12 grams)

+25°C 0 to +70°C –55 to +125°C

ANALOG INPUT MIN. TYP. MAX. MIN. TYP. MAX. MIN. TYP. MAX. UNITS

Input Voltage Range ➁ — ±1.5 — — ±1.5 — — ±1.5 — Volts
Input Resistance 300 350 — 300 350 — 300 350 — Ω
Input Capacitance — 6 15 — 6 15 — 6 15 pF

DIGITAL INPUT

Logic Levels

Logic "1" +2.0 — — +2.0 — — +2.0 — — Volts
Logic "0" — — +0.8 — — +0.8 — — +0.8 Volts
Logic Loading "1" — — +20 — — +20 — — +20 µA
Logic Loading "0" — — –20 — — –20 — — –20 µA

Start Convert Positive Pulse Width ➂ — 50 — — 50 — — 50 — ns

STATIC PERFORMANCE

Resolution — 12 — — 12 — — 12 — Bits
Integral Nonlinearity (f
Differential Nonlinearity (f

in = 10kHz) — ±0.75 — — ±1.0 — — ±1.5 — LSB

in = 10kHz) — ±0.5 ±0.95 0.95 ±0.5 +1 –0.95 ±0.75 +1.25 LSB

Full Scale Absolute Accuracy — ±0.2 ±0.5 — ±0.5 ±0.75 — ±0.75 ±1.5 %FSR
Bipolar Zero Error (Tech Note 2) — ±0.2 ±0.6 — ±0.3 ±0.7 — ±0.6 ±1.0
Unipolar Offset Error (Tech Note 2) — ±0.1 ±0.6 — ±0.3 ±0.7 — ±0.7 ±1.5 %FSR
Gain Error (Tech Note 2) — ±0.1 ±0.5 — ±0.5 ±1.0 — ±1.0 ±2.5 %
No Missing Codes (f

in = 10kHz) 12 — — 12 — — 12 — — Bits

DYNAMIC PERFORMANCE

Peak Harmonics (–0.5dB)

dc to 1MHz — –70 –63 — –70 –63 — –69 –61 dB
1MHz to 2.5MHz — –70 –63 — –70 –63 — –69 –60 dB

2.5MHz to 5MHz — –70 –63 — –70 –63 — –67 –60 dB

Total Harmonic Distortion (–0.5dB)

dc to 1MHz — –69 –63 — –69 –63 — –68 –60 dB
1MHz to 2.5MHz — –68 –63 — –68 –63 — –67 –60 dB

2.5MHz to 5MHz — –68 –63 — –67 –63 — –66 –60

Signal-to-Noise Ratio

(w/o distortion, –0.5dB)
dc to 1MHz 66 69 — 66 69 — 63 67 — dB
1MHz to 2.5MHz 66 69 — 66 69 — 63 66 — dB

2.5MHz to 5MHz 66 69 — 66 69 — 63 66 — dB

Signal-to-Noise Ratio ➃

(& distortion, –0.5dB)
dc to 1MHz 62 66 — 62 66 — 60 65 — dB
1MHz to 2.5MHz 62 66 — 62 66 — 60 65 — dB

2.5MHz to 5MHz 62 66 — 62 66 — 60 64 — dB

Two-tone Intermodulation

Distortion (f

240kHz, f

in = 100kHz,

s = 1MHz, –0.5dB) — –72 — — –72 — — –72 — dB

Noise — 250 — — 300 — — 400 — µVrms
Input Bandwidth (–3dB)

Small Signal (–20dB input) — 60 — — 60 — — 60 — MHz
Large Signal (–0dB input) — 10 — — 10 — — 10 — MHz

Feedthrough Rejection (f

in = 5MHz) — 76 — — 76 — — 76 — dB

Slew Rate — ±400 — — ±400 — — ±400 — V/µs
Aperture Delay Time — 5 — — 5 — — 5 — ns
Aperture Uncertainty — 3 — — 3 — — 3 — ps rms
S/H Aquisition Time

(to ±0.01%FSR, 3V step) 30 35 37 30 35 37 30 35 37 ns

Overvoltage Recovery Time ➄ — 100 — — 100 — — 100 — ns
A/D Conversion Rate 10 — — 500 — — 500 — — MHz

2

® ®

Scale is approximately 5ns per division.

ADS-119

+25°C 0 to +70°C –55 to +125°C

DIGITAL OUTPUTS MIN. TYP. MAX. MIN. TYP. MAX. MIN. TYP. MAX. UNITS

Logic Levels

Logic "1" +2.4 — — +2.4 — — +2.4 — — Volts
Logic "0" — — +0.4 — — +0.4 — — +0.4 Volts
Logic Loading "1" — — –4 — — –4 — — –4 mA
Logic Loading "0" — — +4 — — +4 — — +4 mA

Output Coding Offset Binary

POWER REQUIREMENTS

Power Supply Ranges ➅

+5V Supply +4.75 +5.0 +5.25 +4.75 +5.0 +5.25 +4.9 +5.0 +5.25 Volts
–5V Supply –4.75 –5.0 –5.25 –4.75 –5.0 –5.25 –4.9 –5.0 –5.25 Volts

Power Supply Current

+5V Supply — +200 +215 — +200 +215 — +200 +215 mA
–5V Supply — –180 –205 — –180 –205 — –180 –205 mA

Power Dissipation — 1.8 2.1 — 1.8 2.1 — 1.8 2.1 Watts
Power Supply Rejection — — ±0.01 — — ±0.01 — — ±0.01 %FSR/%V

Footnotes:

➀ All power supplies must be on before applying a start convert pulse. All supplies

and the clock (START CONVERT) must be present during warmup periods. The
device must be continuously converting during this time. There is slight
degradation in performance when using ±12V supplies.

➁ See ordering information for availability of ±5V input range. Contact DATEL for

availability of other input voltage ranges.

➂ A 200ns wide start convert pulse is used for all production testing. Only the rising

edge of the start convert pulse is required for the device to operate
(edge-triggered).

➃ Effective bits is equal to:

(SNR + Distortion) – 1.76 + 20 log

6.02

Full Scale Amplitude

Actual Input Amplitude

➄ This is the time required before the A/D output data is valid after the analog input

is back within the specified range.

TECHNICAL NOTES

1. Obtaining fully specified performance from the ADS-119
requires careful attention to pc-card layout and power
supply decoupling. The device's analog and digital ground
systems are connected to each other internally. For optimal
performance, tie all ground pins (14, 18, and 23) directly to
a large analog ground plane beneath the package.

Bypass all power supplies to ground with 4.7µF tantalum
capacitors in parallel with 0.1µF ceramic capacitors. Locate
the bypass capacitors as close to the unit as possible.

2. The ADS-119 achieves its specified accuracies without the
need for external calibration. If required, the device's small

START

CONVERT

INTERNAL S/H

INTERNAL EOC

DATA

VALID

N

50ns typ.

10ns typ.

Hold

65ns typ.

15ns typ.

Conversion Time

35ns typ.

40ns typ.

Acquisition Time

37ns max.

±5ns

30ns min.

35ns typ.

60ns typ.

initial offset and gain errors can be reduced to zero using
the adjustment circuitry shown in Figures 3 and 4. For
operation without adjustment, tie pin 17 to analog ground.
When using this circuitry, or any similar offset and gain­calibration hardware, make adjustments following warmup.
To avoid interaction, always adjust offset before gain.

3. Applying a start convert pulse while a conversion is in
progress (EOC = logic "1") will initiate a new and inaccurate
conversion cycle.

4. Data is valid only for the time period (55ns, typical) shown in
Figure 2 even if the device is sampling at less than 10MHz.

N+1

Hold

20ns typ.

72ns min.

80ns typ.

83ns max.

40ns typ.

±5ns

DATA

INVALID DATA

10ns typ.

DATA N-1 VALID

55ns typ.

45ns typ.

INVALID DATA

Figure 2. ADS-119 Timing Diagram

3

DATA N VALID

INVALID DATA