Burr Brown Corporation ADS7834PB, ADS7834P, ADS7834EB-2K5, ADS7834EB-250, ADS7834E-2K5 Datasheet

1

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ADS7834

ADS7834

DESCRIPTION

The ADS7834 is a 12-bit sampling analog-to-digital
converter (A/D) complete with sample/hold, internal

2.5V reference, and synchronous serial interface. Typi­cal power dissipation is 11mW at a 500kHz through­put rate. The device can be placed into a power-down
mode which reduces dissipation to just 2.5mW. The
input range is zero to the reference voltage, and the
internal reference can be overdriven by an external
voltage.

Low power, small size, and high-speed make the
ADS7834 ideal for battery operated systems such as
wireless communication devices, portable multi-chan­nel data loggers, and spectrum analyzers. The serial
interface also provides low-cost isolation for remote
data acquisition. The ADS7834 is available in a plastic
mini-DIP-8 or an MSOP-8 package and is guaranteed
over the –40°C to +85°C temperature range.

12-Bit High Speed Low Power Sampling

ANALOG-TO-DIGITAL CONVERTER

®

FEATURES

● 500kHz THROUGHPUT RATE

● 2.5V INTERNAL REFERENCE

● LOW POWER: 11mW

● SINGLE SUPPLY +5V OPERATION

● DIFFERENTIAL INPUT

● SERIAL INTERFACE

● GUARANTEED NO MISSING CODES

● MINI-DIP-8 AND MSOP-8

● 0V TO V

REF

INPUT RANGE

International Airport Industrial Park • Mailing Address: PO Box 11400, Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 • Tel: [phone]

Twx: 910-952-1111 • Internet: http://www.burr-brown.com/ • Cable: BBRCORP • Telex: 066-6491 • FAX: [phone] • Immediate Product Info: [phone]

APPLICATIONS

● BATTERY OPERATED SYSTEMS

● DIGITAL SIGNAL PROCESSING

● HIGH SPEED DATA ACQUISITION

● WIRELESS COMMUNICATION SYSTEMS

©

1998 Burr-Brown Corporation PDS-1457B Printed in U.S.A. May, 2000

ADS7834

SAR

CLK

Serial

Interface

Comparator

S/H Amp

DATA

+In

–In

CDAC

Internal

+2.5V Ref

Buffer

V

REF

CONV

10kΩ ±30%

For most current data sheet and other product

information, visit www.burr-brown.com

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ADS7834

SPECIFICATIONS

At TA = –40°C to +85°C, +VCC = +5V, f

SAMPLE

= 500kHz, f

CLK

= 16 • f

SAMPLE

, internal 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.

ADS7834P, E ADS7834PB, EB

PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS
ANALOG INPUT

Full-Scale Input Span

(1)

+IN – (–IN) 0 V

REF

✻✻V

Absolute Input Range +IN –0.2 V

REF

+0.2 ✻✻V

–IN –0.2 +0.2 ✻✻V
Capacitance 25 ✻ pF
Leakage Current 1 ✻ µA

SYSTEM PERFORMANCE

Resolution 12 ✻ Bits
No Missing Codes 12 ✻ Bits
Integral Linearity Error ±1 ±2 ±0.5 ±1 LSB

(2)

Differential Linearity Error ±0.8 ±0.5 ±1 LSB
Offset Error ±2 ±5 ±1 ✻ LSB
Gain Error

(3)

25°C ±12 ±30 ±7 ±15 LSB

–40°C to +85°C ±50 ±35 LSB

Common-Mode Rejection DC, 0.2Vp-p 70 ✻ dB

1MHz, 0.2Vp-p 50 ✻ dB
Noise 60 ✻ µVrms
Power Supply Rejection Worst Case ∆, +V

CC

= 5V ±5% 1.2 ✻ LSB

SAMPLING DYNAMICS

Conversion Time 1.625 ✻ µs
Acquisition Time 0.350 ✻ µs
Throughput Rate 500 ✻ kHz
Aperture Delay 5 ✻ ns
Aperture Jitter 30 ✻ ps
Step Response 350 ✻ ns

DYNAMIC CHARACTERISTICS

Signal-to-Noise Ratio V

IN

= 5Vp-p at 10kHz 72 ✻ dB

Total Harmonic Distortion

(4)

VIN = 5Vp-p at 10kHz –78 –72 –82 –75 dB

Signal-to-(Noise+Distortion) V

IN

= 5Vp-p at 10kHz 68 70 70 72 dB

Spurious Free Dynamic Range V

IN

= 5Vp-p at 10kHz 72 78 75 82 dB

Usable Bandwidth SNR > 68dB 350 ✻ kHz

REFERENCE OUTPUT

Voltage I

OUT

= 0 2.475 2.50 2.525 2.48 ✻ 2.52 V

Source Current

(5)

Static Load 50 ✻ µA

Drift I

OUT

= 0 20 ✻ ppm/ °C

Line Regulation 4.75V ≤ V

CC

≤ 5.25V 0.6 ✻ mV

REFERENCE INPUT

Range 2.0 2.55 ✻✻V
Resistance

(6)

to Internal Reference Voltage 10 ✻✻✻ kΩ

DIGITAL INPUT/OUTPUT

Logic Family CMOS ✻
Logic Levels:

V

IH

|IIH| ≤ +5µA 3.0 V

CC

+0.3 ✻✻V

V

IL

|IIL| ≤ +5µA –0.3 0.8 ✻✻V

V

OH

IOH = –500µA 3.5 ✻✻V

V

OL

IOL = 500µA 0.4 ✻✻V

Data Format Straight Binary ✻

POWER SUPPLY REQUIREMENT

+V

CC

Specified Performance 4.75 5.25 ✻✻V

Quiescent Current f

SAMPLE

= 500kHz 2.2 ✻ mA

Power-Down 0.5 ✻ mA

Power Dissipation f

SAMPLE

= 500kHz 11 20 ✻✻ mW

Power-Down 2.5 ✻ mW

TEMPERATURE RANGE

Specified Performance –40 +85 ✻✻°C

✻ Specifications same as ADS7834P,E.

NOTES: (1) Ideal input span, does not include gain or offset error. (2) LSB means Least Significant Bit, with V

REF

equal to +2.5V, one LSB is 610µV. (3) Measured
relative to an ideal, full-scale input (+IN – (–IN)) of 2.499V. Thus, gain error includes the error of the internal voltage reference. (4) Calculated on the first nine
harmonics of the input frequency. (5) If the internal reference is required to source current to an external load, the reference voltage will change due to the internal
10kΩ resistor. (6) Can vary ±30%.

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ADS7834

1
2
3
4

8
7
6
5

+V

CC

CLK
DATA
CONV

V

REF

+IN
–IN

GND

ADS7834

MSOP-8

1
2
3
4

8
7
6
5

+V

CC

CLK
DATA
CONV

V

REF

+IN
–IN

GND

ADS7834

Plastic Mini-DIP-8

+VCC to GND............................................................................–0.3V to 6V

Analog Inputs to GND .............................................. –0.3V to (V

CC

+ 0.3V)

Digital Inputs to GND ............................................... –0.3V to (V

CC

+ 0.3V)

Power Dissipation .......................................................................... 325mW

Maximum Junction Temperature ................................................... +150°C

Operating Temperature Range ......................................... –40°C to +85°C

Storage Temperature Range .......................................... –65°C to +150°C

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

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.

ELECTROSTATIC
DISCHARGE SENSITIVITY

Electrostatic discharge can cause damage ranging from per­formance degradation to complete device failure. Burr­Brown Corporation recommends that all integrated circuits
be handled and stored using appropriate ESD protection
methods.

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
published specifications.

ABSOLUTE MAXIMUM RATINGS

(1)

PIN CONFIGURATION

Top View

PIN NAME DESCRIPTION

1V

REF

Reference Output. Decouple to ground with a 0.1µF ceramic capacitor and a 2.2µF tantalum capacitor.
2 +IN Non-Inverting Input.
3 –IN Inverting Input. Connect to ground or to remote ground sense point.
4 GND Ground.
5 CONV Convert Input. Controls the sample/hold mode, start of conversion, start of serial data transfer, type of serial transfer, and power

down mode. See the Digital Interface section for more information.
6 DATA Serial Data Output. The 12-bit conversion result is serially transmitted most significant bit first with each bit valid on the rising edge

of CLK. By properly controlling the CONV input, it is possibly to have the data transmitted least significant bit first. See the Digital

Interface section for more information.
7 CLK Clock Input. Synchronizes the serial data transfer and determines conversion speed.
8+V

CC

Power Supply. Decouple to ground with a 0.1µF ceramic capacitor and a 10µF tantalum capacitor.

PIN ASSIGNMENTS

PACKAGE/ORDERING INFORMATION

MAXIMUM MAXIMUM

INTEGRAL DIFFERENTIAL

LINEARITY LINEARITY PACKAGE SPECIFICATION

ERROR ERROR DRAWING TEMPERATURE PACKAGE ORDERING TRANSPORT

PRODUCT (LSB) (LSB) PACKAGE NUMBER

(1)

RANGE MARKING

(2)

NUMBER

(3)

MEDIA

ADS7834E ±2 N/S

(4)

MSOP-8 337 –40°C to +85°C C34 ADS7834E/250 Tape and Reel

ADS7834E

""""""ADS7834E/2K5 Tape and Reel

ADS7834EB ±1 ±1 MSOP-8 337 –40°C to +85°C C34 ADS7834EB/250 Tape and Reel
ADS7834EB

""""""ADS7834EB/2K5 Tape and Reel

ADS7834P ±2 N/S

(4)

Plastic DIP-8 006 –40°C to +85°C ADS7834P ADS7834P Rails

ADS7834PB ±1 ±1

"" "ADS7834PB ADS7834PB Rails

NOTE: (1) For detail drawing and dimension table, please see end of data sheet or Package Drawing File on Web. (2) Performance Grade information is marked
on the reel. (3) Models with a slash(/) are available only in Tape and reel in quantities indicated (e.g. /250 indicates 250 units per reel, /2K5 indicates 2500 devices
per reel). Ordering 2500 pieces of ”ADS7834E/2K5“ will get a single 2500-piece Tape and Reel. For detailed Tape and Reel mechanical information, refer to the
www.burr-brown.com web site under Applications and Tape and Reel Orientation and Dimensions. (4) N/S = Not Specified, typical only. However, 12-Bits no missing
codes is guaranteed over temperature.

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ADS7834

SUPPLY CURRENT vs SAMPLE RATE

400100 600200 300 500

Sample Rate (kHz)

Supply Current (mA)

1.7

2.4

2.3

2.2

2.1

2.0

1.9

1.8

TYPICAL PERFORMANCE CURVES

At TA = +25°C, VCC = +5V, f

SAMPLE

= 500kHz, f

CLK

= 16 • f

SAMPLE

, and internal +2.5V reference, unless otherwise specified.

FULL-SCALE ERROR vs TEMPERATURE

20–40 100–20 0 40

Temperature (°C)

Delta from +25°C (LSB)

1

0
–1
–2
–3
–4
–5
–6
–7
–8

60 80

OFFSET VOLTAGE vs TEMPERATURE

–40 100–20 0 20 40

Temperature (°C)

Delta from +25°C (LSB)

0.5

0.4

0.3

0.2

0.1
0

–0.1
–0.2
–0.3

60 80

POWER-DOWN SUPPLY CURRENT

vs TEMPERATURE

20–40 100–20 0 40

Temperature (°C)

Power-down Supply Current (µA)

390

470

440
430
420
410
400

450

460

60 80

SUPPLY CURRENT vs TEMPERATURE

20–40 100–20 0 40

Temperature (°C)

Supply Current (mA)

1.6

2.3

2.1

2.0

1.9

1.8

1.7

2.2

60 80

f

SAMPLE

= 500kHz

f

SAMPLE

= 125kHz

INTEGRAL LINEARITY and DIFFERENTIAL LINEARITY

vs SAMPLE RATE

300100 600200 400

Sample Rate (kHz)

Delta from f

SAMPLE

= 500kHz (LSB)

0.06

0.04

0.02
0

–0.02
–0.04
–0.06
–0.08

–0.1

500

Change in Integral

Linearity (LSB)

Change in Differential

Linearity (LSB)