Burr Brown Corporation DCP012415DP-U, ADS1201U-1K, ADS1201U Datasheet

ADS1201

®

©

1997 Burr-Brown Corporation PDS-1417C Printed in U.S.A. October, 1999

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High Dynamic Range

DELTA-SIGMA MODULATOR

ADS1201

+2.5V

Reference

Bias

Generator

Second-Order

∆Σ

Modulator

AVDDAGND REF

OUT

REF

IN

V

BIAS

CAL GAIN/OFFSET DGNDDV

DD

AINP

A

IN

N

MOUT

BIAS

EN

REF

EN

MCLK

DESCRIPTION

The ADS1201 is a precision, 130dB dynamic range,
delta-sigma (∆Σ) modulator operating from a single
+5V supply. The differential inputs are ideal for direct
connection to transducers or low level signals. With
the appropriate digital filter and modulator rate, the
device can be used to achieve 24-bit analog-to-digital
(A/D) conversion with no missing codes. Effective
resolution of 20 bits can be maintained with a digital
filter bandwidth of 1kHz at a modulator rate of 320kHz.

The ADS1201 is designed for use in high resolution
measurement applications including smart transmit­ters, industrial process control, weigh scales, chroma­tography, and portable instrumentation. It is available
in a 16-lead SOIC package.

FEATURES

● 130dB DYNAMIC RANGE

● FULLY DIFFERENTIAL INPUT

● TWO-WIRE INTERFACE

● INTERNAL/EXTERNAL REFERENCE

● ON-CHIP SWITCHES FOR CALIBRATION

APPLICATIONS

● INDUSTRIAL PROCESS CONTROL

● INSTRUMENTATION

● SMART TRANSMITTERS

● PORTABLE INSTRUMENTS

● WEIGH SCALES

● PRESSURE TRANSDUCERS

2

ADS1201

®

At TA = +25°C, AVDD = DVDD = +5V, MCLK = 320kHz, REFEN LOW, BIASEN LOW, and external +2.5V reference, unless otherwise specified.

The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN assumes
no responsibility for the use of this information, and all use of such information shall be entirely at the user’s own risk. Prices and specifications are subject to change
without notice. No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. BURR-BROWN does not authorize or warrant
any BURR-BROWN product for use in life support devices and/or systems.

SPECIFICATIONS

ADS1201U

PARAMETER CONDITIONS MIN TYP MAX UNITS

ANALOG INPUT

Absolute Input Voltage Range 0 +5 V

With V

BIAS

(1)

–10 +10 V

Differential Input Voltage Range –5 +5 V

With V

BIAS

(1)

–20 See Note 2 +20 V

Input Impedance 250

(4)

kΩ
Input Capacitance 8pF
Input Leakage Current 550pA

At T

MIN

to T

MAX

1nA

SYSTEM PERFORMANCE

Dynamic Range 10Hz Bandwidth

(5)

130

(6)

dB

60Hz Bandwidth

(5)

115

(6)

120

(6)

dB

1kHz Bandwidth

(5)

115

(6)

dB
Integral Linearity Error 60Hz Bandwidth

(5)

±0.0015 %FSR

1kHz Bandwidth

(5)

±0.0015 %FSR

Offset Error

(2)

See Note 7 µV

Offset Drift

(3)

1 µV/°C

Gain Error

(2)

See Note 7 ppm

Gain Error Drift

(3)

1 µV/°C
Common-Mode Rejection At DC 80 100 dB
Power Supply Rejection 80 dB

REFERENCE

Internal Reference (REF

OUT

) 2.4 2.5 2.6 V
Drift 25 ppm/°C
Noise 50 µVp-p
Load Current Source or Sink –1 1 mA
Output Impedance 2 Ω

External Reference (REF

IN

) 2.0 3.0 V

Load Current 2.5 µA

V

BIAS

Output Using Internal Reference 3.15 3.3 3.45 V
Drift 50 ppm/°C
Load Current 10 mA

DIGITAL INPUT/OUTPUT

Logic Family TTL Compatible CMOS
Logic Levels:

V

IH

(MCLK) IIH = +5µA 2.0 DV

DD

+0.3 V

V

IL

(MCLK) IIL = +5µA –0.3 0.8 V
V

OH

(MOUT) IOH = 2 TTL Loads 2.4 V

V

OL

(MOUT) IOL = 2 TTL Loads 0.4 V

MCLK Frequency 0.02 1 MHz

POWER SUPPLY REQUIREMENTS

Power Supply Voltage Specified Performance 4.75 5.25 V
Supply Current

Analog Current 4.6 mA
Digital Current 0.4 mA

Additional Analog Current

REF

OUT

Enabled No Load 1.6 mA

V

BIAS

Enabled No Load 1 mA

Total Power Dissipation REF

OUT

, V

BIAS

Disabled 25 40 mW

TEMPERATURE RANGE

Specified Performance –40 +85 °C

NOTES: (1) This range is set with external resistors and V

BIAS

(as described in the text). Other ranges are possible. (2) After the on-chip offset and gain
calibration functions have been employed. (3) Re-calibration can reduce these errors. (4) Input impedance changes with MCLK. (5) Assume brick wall digital
filter is used. (6) 20 Log (full scale/r ms noise). (7) After calibration, these errors will be of the order of the effective resolution.

3

®

ADS1201

Analog Input: Current................................................ ±100mA, Momentary

±10mA, Continuous

Voltage ................................... AGND –0.3V to AV

DD

+0.3V

AV

DD

to DVDD...........................................................................–0.3V to 6V

AV

DD

to AGND .........................................................................–0.3V to 6V

DV

DD

to DGND.........................................................................–0.3V to 6V

AGND to DGND ................................................................................ ±0.3V

REF

IN

Voltage to AGND............................................ –0.3V to AVDD +0.3V

Digital Input Voltage to DGND ..................................–0.3V to DV

DD

+0.3V

Digital Output Voltage to DGND ............................... –0.3V to DV

DD

+0.3V

Lead Temperature (soldering, 10s) .............................................. +300°C

Internal Power Dissipation ............................................................. 500mW

NOTE: (1) Stresses above those listed under “Absolute Maximum Ratings” may
cause permanent damage to the device. Exposure to absolute maximum
conditions for extended periods may affect device reliability.

ABSOLUTE MAXIMUM RATINGS

ELECTROSTATIC
DISCHARGE SENSITIVITY

This integrated circuit can be damaged by ESD. Burr-Brown
recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling
and installation procedures can cause damage.

ESD damage can range from subtle performance degradation
to complete device failure. Precision integrated circuits may
be more susceptible to damage because very small parametric
changes could cause the device not to meet its published
specifications.

PACKAGE SPECIFIED
DRAWING TEMPERATURE PACKAGE ORDERING TRANSPORT

PRODUCT PACKAGE NUMBER RANGE MARKING NUMBER

(1)

MEDIA

ADS1201U SOL-16 211 –40°C to +85°C ADS1201U ADS1201U Rails

"""""ADS1201U/1K Tape and Reel

NOTE: (1) Models with a slash (/) are available only in Tape and Reel in the quantities indicated (e.g., /1K indicates 1000 devices per reel). Ordering 1000 pieces
of “ADS1201U/1K” will get a single 1000-piece Tape and Reel.

PACKAGE/ORDERING INFORMATION

PIN CONFIGURATION

Top View SOIC

1AVDDAnalog Input: Analog Supply, +5V nominal.
2 REF

OUT

Analog Output: Internal Reference Voltage Output:
+2.5V nominal.

3 REF

IN

Analog Input: Reference Voltage Input.
4 NIC Not Internally Connected.
5A

IN

P Analog Input: Noninverting Input.

6A

IN

N Analog Input: Inverting Input.
7 AGND Analog Input: Analog Ground.
8V

BIAS

Analog Output: Bias Voltage Output, nominally
+3.3V (with +2.5V reference).

9 BIAS

EN

Digital Input: Bias Voltage Enable Input (HIGH =
enabled, LOW = disabled).

10

GAIN/OFFSET

Digital Input: Gain/Offset Calibration Select Input
(with CAL LOW; HIGH = gain configuration,
LOW = offset configuration).

11 CAL Digital Input: Calibration Control Input (HIGH =

normal operation, LOW = gain or offset

calibration configuration).
12 DGND Digital Input: Digital Ground.
13 DV

DD

Digital Input: Digital Supply, +5V nominal.
14 MCLK Digital Input: Modulator Clock Input. CMOS

compatible.
15 MOUT Digital Output: Modulator Output.
16 REF

EN

Digital Input: REF

OUT

Voltage Enable Input

(HIGH = enabled, LOW = disabled).

PIN DESCRIPTIONS

PIN NO

NAME DESCRIPTION

ADS1201

1
2
3
4
5
6
7
8

16
15
14
13
12
11
10

9

AV

DD

REF

OUT

REF

IN

NIC

A

IN

P

A

IN

N

AGND

V

BIAS

REF

EN

MOUT
MCLK
DV

DD

DGND
CAL
GAIN/OFFSET
BIAS

EN

4

ADS1201

®

TYPICAL PERFORMANCE CURVES

At TA = +25°C, AVDD = DVDD = +5V, MCLK = 320kHz, REFEN LOW, BIASEN LOW, and external +2.5V reference, unless otherwise specified.

1.2

1

0.8

0.6

0.4

0.2

0

rms NOISE

V

DIN

(V)

–5–4–3–2–1012345

(ppm)

1.5

1.0

0.5
0

–0.5
–1.0
–1.5
–2.0
–2.5
–3.0
–3.5

LINEARITY

V

DIN

(V)

–5–4–3–2–1012345

(ppm)

110

105

100

95

CMRR vs FREQUENCY

Frequency (Hz)

0.1 1 10 100 1000

CMRR (dB)

70

68

66

64

62

60

PSRR vs FREQUENCY

Frequency (Hz)

0.1 1.0 10 100 1k 10k 100k

PSRR (dB)

30

25

20

15

10

5

0

TYPICAL SINK CURRENT

V

OL

(V)

0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0

I

OUT

(mA)

30

25

20

15

10

5

0

TYPICAL SOURCE CURRENT

V

OL

(V)

0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0

I

OUT

(mA)