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Burr-Brown Corporation

ADS7803 Datasheet Preview

ADS7803 Datasheet

Autocalibrating/ 4-Channel/ 12-Bit ANALOG-TO-DIGITAL CONVERTER

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® ADS7803
Autocalibrating, 4-Channel, 12-Bit
ANALOG-TO-DIGITAL CONVERTER
FEATURES
q LOW POWER: 10mW plus Power Down
q SIGNAL-TO-(NOISE + DISTORTION)
RATIO OVER TEMPERATURE:
69dB min with fIN = 1kHz
66dB min with fIN = 50kHz
q FAST CONVERSION TIME: 8.5µs
Including Acquisition (117kHz Sampling
Rate)
q DC PERFORMANCE OVER
TEMPERATURE:
±3/4 LSB max Total Error
±1/4 LSB max Channel Mismatch
q FOUR-CHANNEL INPUT MULTIPLEXER
q SINGLE SUPPLY: +5V
q PIN COMPATIBLE WITH ADC7802
DESCRIPTION
The ADS7803 is a monolithic CMOS 12-bit analog-
to-digital converter with internal sample/hold and four-
channel multiplexer. It is designed and tested for full
dynamic performance with input signals to 50kHz. An
autocalibration cycle guarantees a total unadjusted
error within ±3/4LSB over the specified temperature
range, eliminating the need for offset or gain adjust-
ment. The 5V single-supply requirements and stan-
dard CS, RD, and WR control signals make the part
easy to use in microprocessor applications. Conver-
sion results are available in two bytes through an 8-bit
three-state output bus.
The ADS7803 is available in a 28-pin plastic DIP and
28-lead PLCC, fully specified for operation over the
industrial –40°C to +85°C temperature range.
A0 Address
Calibration
Latch and
Microcontroller
A1 Decoder
and Memory
Clock
Control
Logic
CS
RD
WR
SFR
AIN0
AIN1
AIN2
AIN3
Analog
Multiplexer
Capacitor Array
Sampling ADC
VREF+ VREF
Three-State
Input/Output
BUSY
8-Bit
Data Bus
International Airport Industrial Park • Mailing Address: PO Box 11400 • Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd. • Tucson, AZ 85706
Tel: (520) 746-1111 • Twx: 910-952-1111 • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
©1991 Burr-Brown Corporation
PDS-1126A
Printed in U.S.A. August, 1993




Burr-Brown Corporation

ADS7803 Datasheet Preview

ADS7803 Datasheet

Autocalibrating/ 4-Channel/ 12-Bit ANALOG-TO-DIGITAL CONVERTER

No Preview Available !

SPECIFICATIONS
ELECTRICAL
VA = VD = VREF+ = 5V ±5%; VREF– = AGND = DGND = 0V; CLK = 2MHz external, TA = –40°C to +85°C, after calibration at any temperature, unless otherwise specified.
PARAMETER
CONDITIONS
ADS7803BP/ADS7803BN
MIN
TYP
MAX
UNITS
RESOLUTION
12 Bits
ANALOG INPUT
Voltage Input Range
Input Capacitance
On State Bias Current
Off State Bias Current
On Resistance Multiplexer
Off Resistance Multiplexer
Channel Separation
VREF+ = 5V, VREF– = 0V
TA = +25°C
TA = –40°C to +85°C
500Hz
0
5V
50 pF
100 nA
10 nA
100 nA
2 k
10 M
92 dB
REFERENCE INPUT
For Specified Performance: VREF+
VREF
For Derated Performance(1): VREF+
VREF
Input Reference Current
THROUGHPUT TIMING
Conversion Time With External Clock (Including
Multiplexer Settling Time and Acquisition Time)
With Internal Clock Using Recommended
Clock Components
Multiplexer Settling Time to 0.01%
Multiplexer Access Time
VREF+ VA
VREF+ = 5V, VREF– = 0V
CLK = 2MHz
CLK = 1MHz
CLK = 500kHz
TA = +25°C
TA = –40°C to +85°C
4.5
0
5V
0V
VA V
1V
10 100 µA
8.5 µs
17 µs
34 µs
10 µs
10 µs
460 ns
20 ns
DC ACCURACY
Total Error, All Channels(2)
Differential Nonlinearity
No Missing Codes
Gain Error
Gain Error Drift
Offset Error
Offset Error Drift
Channel-to-Channel Mismatch
Power Supply Sensitivity
AC ACCURACY
Signal-to-(Noise + Distortion) Ratio
Total Harmonic Distortion
Signal-to-Noise Ratio
Spurious Free Dynamic Range
SAMPLING DYNAMICS
Full Power Bandwidth
Aperture Delay
Offset Error
DIGITAL INPUTS
All Pins Other Than CLK: VIL
VIH
Input Current
CLK Input: VIL
VIH
IIL
IIH
IIH
All Channels
Between Calibration Cycles
All Channels
Between Calibration Cycles
VA = VD = 4.75V to 5.25V
fIN = 1kHz
fIN = 50kHz
fIN = 50kHz
fIN = 50kHz
fIN = 1kHz
fIN = 50kHz
–3dB
SFR D2 LOW
SRF D2 HIGH
SFR D2 LOW
SFR D2 HIGH, Internal Clock or
Sampling Command Synchronous
to External Clock
SFR D2 HIGH, Sampling Command
Asynchronous to External Clock
69
66
TA = +25°C, VIN = 0 to VD
TA = –40°C to +85°C, VIN = 0 to VD
Power Down Mode (D3 in SFR HIGH)
2.4
3.5
±1/2
±1/4
Guaranteed
±1/8
±0.2
±1/8
±0.2
±1/8
71
69
–75
70
90
82
4
2500
5
±1/8
±1/2
±4
±3/4
±1/2
±1/4
±1/4
±1/4
±1/4
±1
0.8
1
10
0.8
10
1.5
100
LSB
LSB
LSB
ppm/°C
LSB
ppm/°C
LSB
LSB
dB
dB
dB
dB
dB
dB
MHz
ns
ns
LSB
LSB
LSB
V
V
µA
µA
V
V
µA
mA
nA
NOTES: (1) For (VREF+) – (VREF–) as low as 4.5V, the total error will typically not exceed ±1LSB. (2) After calibration cycle, without external adjustment. Includes gain
(full scale) error, offset error, integral nonlinearity, differential nonlinearity, and drift.
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.
®
ADS7803
2


Part Number ADS7803
Description Autocalibrating/ 4-Channel/ 12-Bit ANALOG-TO-DIGITAL CONVERTER
Maker Burr-Brown Corporation
Total Page 13 Pages
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