Burr Brown Corporation ADS7804UB, ADS7804U-1K, ADS7804U, ADS7804PB, ADS7804P Datasheet

©

1992 Burr-Brown Corporation PDS-1156C Printed in U.S.A. February, 1996

FEATURES

● 100kHz min SAMPLING RATE

● STANDARD ±10V INPUT RANGE

● 72dB min SINAD WITH 45kHz INPUT

● ±0.45 LSB max INL

● DNL: 12 Bits “No Missing Codes”

● SINGLE +5V SUPPLY OPERATION

● PIN-COMPATIBLE WITH 16-BIT ADS7805

● USES INTERNAL OR EXTERNAL

REFERENCE

● COMPLETE WITH S/H, REF, CLOCK, ETC.

● FULL PARALLEL DATA OUTPUT

● 100mW max POWER DISSIPATION

● 28-PIN 0.3" PLASTIC DIP AND SOIC

ADS7804

DESCRIPTION

The ADS7804 is a complete 12-bit sampling A/D
using state-of-the-art CMOS structures. It contains a
complete 12-bit, capacitor-based, SAR A/D with S/H,
reference, clock, interface for microprocessor use, and
three-state output drivers.

The ADS7804 is specified at a 100kHz sampling rate,
and guaranteed over the full temperature range. Laser­trimmed scaling resistors provide an industry­standard ±10V input range, while the innovative de-
sign allows operation from a single +5V supply, with
power dissipation under 100mW.

The 28-pin ADS7804 is available in a plastic 0.3" DIP
and in an SOIC, both fully specified for operation over
the industrial –40°C to +85°C range.

12-Bit 10µs Sampling CMOS

ANALOG-to-DIGITAL CONVERTER

Successive Approximation Register and Control Logic

Clock

Output

Latches

and

Three

State

Drivers

Three

State

Parallel

Data

Bus

BUSY

Comparator

BYTE

CS

R/C

CDAC

Internal

+2.5V Ref

Buffer

4kΩ

±10V Input

REF

CAP

20kΩ

4kΩ10kΩ

®

DEMO BOARD

AVAILABLE

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/ • FAXLine: [phone] (US/Canada Only) • Cable: BBRCORP • Telex: 066-6491 • FAX: [phone] • Immediate Product Info: [phone]

ADS7804

ADS7804

2

®

ADS7804

RESOLUTION 12 * Bits
ANALOG INPUT

Voltage Ranges ±10V * V
Impedance 23 * kΩ
Capacitance 35 * pF

THROUGHPUT SPEED

Conversion Time 5.7 8 * * µs
Complete Cycle Acquire and Convert 10 * µs
Throughput Rate 100 * kHz

DC ACCURACY

Integral Linearity Error ±0.9 ±0.45 LSB

(1)

Differential Linearity Error ±0.9 ±0.45 LSB
No Missing Codes * Bits
Transition Noise

(2)

0.1 * LSB

Full Scale Error

(3,4)

±0.5 ±0.25 %
Full Scale Error Drift ±7 ±5 ppm/°C
Full Scale Error

(3,4)

Ext. 2.5000V Ref ±0.5 ±0.25 %
Full Scale Error Drift Ext. 2.5000V Ref ±2 * ppm/°C
Bipolar Zero Error

(3)

±10 ±10 mV
Bipolar Zero Error Drift ±2 * ppm/°C
Power Supply Sensitivity +4.75V < V

D

< +5.25V ±0.5 * LSB

(V

DIG

= V

ANA

= VD)

AC ACCURACY

Spurious-Free Dynamic Range f

IN

= 45kHz 80 * dB

(5)

Total Harmonic Distortion f

IN

= 45kHz –80 * dB

Signal-to-(Noise+Distortion) f

IN

= 45kHz 70 72 dB

Signal-to-Noise f

IN

= 45kHz 70 72 dB

Full-Power Bandwidth

(6)

250 * kHz

SAMPLING DYNAMICS

Aperture Delay 40 * ns
Aperture Jitter *
Transient Response FS Step 2 * µs
Overvoltage Recovery

(7)

150 * ns

REFERENCE

Internal Reference Voltage 2.48 2.5 2.52 * * * V
Internal Reference Source Current 1 * µA

(Must use external buffer.)

Internal Reference Drift 8 ppm/°C
External Reference Voltage Range 2.3 2.5 2.7 * * * V

for Specified Linearity

External Reference Current Drain Ext. 2.5000V Ref 100 * µA

DIGITAL INPUTS

Logic Levels

V

IL

–0.3 +0.8 * * V

V

IH

+2.0 VD +0.3V * * V

I

IL

±10 * µA

I

IH

±10 * µA

DIGITAL OUTPUTS

Data Format
Data Coding

V

OL

I

SINK

= 1.6mA +0.4 * V

V

OH

I

SOURCE

= 500µA+4 * V

Leakage Current High-Z State, ±5*µA

V

OUT

= 0V to V

DIG

Output Capacitance High-Z State 15 15 pF

DIGITAL TIMING

Bus Access Time 83 * ns
Bus Relinquish Time 83 * ns

SPECIFICATIONS

ELECTRICAL

At TA = –40°C to +85°C, fS = 100kHz, and V

DIG

= V

ANA

= +5V, using internal reference, unless otherwise specified.

ADS7804P, U ADS7804PB, UB

PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS

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.

Guaranteed

Sufficient to meet AC specs

Parallel 12 bits

Binary Two’s Complement

®

ADS7804

3

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.

SPECIFICATIONS (CONT)

ELECTRICAL

At TA = –40°C to +85°C, fS = 100kHz, and V

DIG

= V

ANA

= +5V, using internal reference, unless otherwise specified.

ADS7804P, U ADS7804PB, UB

PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS

ABSOLUTE MAXIMUM RATINGS

Analog Inputs: VIN............................................................................. ±25V

CAP ................................... +V

ANA

+0.3V to AGND2 –0.3V

REF .......................................... Indefinite Short to AGND2

Momentary Short to V

ANA

Ground Voltage Differences: DGND, AGND1, AGND2 ................. ±0.3V

V

ANA

....................................................................................................... 7V

V

DIG

to V

ANA

..................................................................................... +0.3V

V

DIG

....................................................................................................... 7V

Digital Inputs ........................................................... –0.3V to +V

DIG

+0.3V

Maximum Junction Temperature................................................... +165°C

Internal Power Dissipation ............................................................. 825mW

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

PACKAGE INFORMATION

PACKAGE DRAWING

PRODUCT PACKAGE NUMBER

(1)

ADS7804P Plastic DIP 246
ADS7804PB Plastic DIP 246
ADS7804U SOIC 217
ADS7804UB SOIC 217

NOTE: (1) For detailed drawing and dimension table, please see end of data
sheet, or Appendix C of Burr-Brown IC Data Book.

MINIMUM

SIGNAL-TO-

MAXIMUM (NOISE + SPECIFICATION

LINEARITY DISTORTION) TEMPERATURE

PRODUCT ERROR (LSB) RATIO (dB) RANGE PACKAGE

ADS7804P ±0.9 70 –40°C to +85°C Plastic DIP
ADS7804PB ±0.45 72 –40°C to +85°C Plastic DIP
ADS7804U ±0.9 70 –40°C to +85°C SOIC
ADS7804UB ±0.45 72 –40°C to +85°C SOIC

ORDERING INFORMATION

POWER SUPPLIES

Specified Performance

V

DIG

Must be ≤ V

ANA

+4.75 +5 +5.25 * * * V

V

ANA

+4.75 +5 +5.25 * * * V

+I

DIG

0.3 * mA

+I

ANA

16 * mA

Power Dissipation f

S

= 100kHz 100 * mW

TEMPERATURE RANGE

Specified Performance –40 +85 * * °C
Derated Performance –55 +125 * * °C
Storage –65 +150 • • °C
Thermal Resistance (

θ

JA

)
Plastic DIP 75 * °C/W
SOIC 75 * °C/W

NOTES: (1) LSB means Least Significant Bit. For the 12-bit, ±10V input ADS7804, one LSB is 4.88mV. (2) Typical rms noise at worst case transitions and
temperatures. (3) As measured with fixed resistors shown in Figure 4. Adjustable to zero with external potentiometer. (4) Full scale error is the worst case of –Full
Scale or +Full Scale untrimmed deviation from ideal first and last code transitions, divided by the transition voltage (not divided by the full-scale range) and includes
the effect of offset error. (5) All specifications in dB are referred to a full-scale ±10V input. (6) Full-Power Bandwidth defined as Full-Scale input frequency at which
Signal-to-(Noise + Distortion) degrades to 60dB, or 10 bits of accuracy. (7) Recovers to specified performance after 2 x FS input overvoltage.