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ADS7808U Schematic ( PDF Datasheet ) - Burr-Brown Corporation

Teilenummer ADS7808U
Beschreibung 12-Bit 10ms Serial CMOS Sampling ANALOG-to-DIGITAL CONVERTER
Hersteller Burr-Brown Corporation
Logo Burr-Brown Corporation Logo 




Gesamt 10 Seiten
ADS7808U Datasheet, Funktion
®
ADS7808
ADS7808
ADS7808
12-Bit 10µs Serial CMOS Sampling
ANALOG-to-DIGITAL CONVERTER
FEATURES
q 100kHz SAMPLING RATE
q 72dB SINAD WITH 45kHz INPUT
q ±1/2 LSB INL AND DNL
q SIX SPECIFIED INPUT RANGES
q SERIAL OUTPUT
q SINGLE +5V SUPPLY OPERATION
q PIN-COMPATIBLE WITH 16-BIT ADS7809
q USES INTERNAL OR EXTERNAL
REFERENCE
q 100mW MAX POWER DISSIPATION
q 20-PIN 0.3" PLASTIC DIP AND SOIC
q SIMPLE DSP INTERFACE
DESCRIPTION
The ADS7808 is a complete 12-bit sampling analog-
to-digital using state-of-the-art CMOS structures. It
contains a 12-bit capacitor-based SAR A/D with S/H,
reference, clock, and a serial data interface. Data can
be output using the internal clock, or can be synchro-
nized to an external data clock. The ADS7808 also
provides an output synchronization pulse for ease of
use with standard DSP processors.
The ADS7808 is specified at a 100kHz sampling rate,
and guaranteed over the full temperature range. Laser-
trimmed scaling resistors provide various input ranges
including ±10V and 0V to 5V, while an innovative
design operates from a single +5V supply, with power
dissipation under 100mW.
The 20-pin ADS7808 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.
R1IN
R2IN
R3IN
CAP
20k
10k
20k
5k
REF
R/C CS Power Down
Successive Approximation Register and Control Logic
CDAC
Buffer
4k
Internal
+2.5V Ref
Comparator
Clock
Serial
Data
Out
BUSY
Data Clock
Serial Data
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
Internet: http://www.burr-brown.com/ • FAXLine: (800) 548-6133 (US/Canada Only) • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
©1992 Burr-Brown Corporation
PDS-11155B
APDrinSted7in8U0.S8.A. January 1997
®






ADS7808U Datasheet, Funktion
SPECIFIC FUNCTION
Initiate Conversion and
Output Data Using
Internal Clock
CS R/C BUSY EXT/INT DATACLK PWRD SB/BTC
1>0 0
1
0
Output
0
x
0
1>0
1
0
Output
0
x
Initiate Conversion and 1>0 0
1
1
Input
0
Output Data Using External 0
1>0
1
1
Input
0
Clock
1>0 1
1
1
Input
x
x
x
x
1>0 1
0
1
Input
0
x
0
0>1
0
1
Input
0
x
Incorrect Conversions
0 0 0>1 x
x0
Power Down
x x xx
x x xx
x0
x1
x x xx
Selecting Output Format
x
x x xx
x
NOTE: (1) See Figure 3b for constraints on previous data valid during conversion.
Table III. Control Truth Table.
x
x
x
x
x
0
1
OPERATION
Initiates conversion “n”. Data from conversion “n–1”
clocked out on DATA synchronized to 12 clock
pulses output on DATACLK.
Initiates conversion “n”. Data from conversion “n–1”
clocked out on DATA synchronized to 12 clock
pulses output on DATACLK.
Initiates conversion “n”.
Initiates conversion “n”.
Outputs a pulse on SYNC followed by data from
conversion “n” clocked out synchronized to external
DATACLK.
Outputs a pulse on SYNC followed by data from
conversion “n–1” clocked out synchronized to
external DATACLK.(1) Conversion “n” in process.
Outputs a pulse on SYNC followed by data from
conversion “n–1” clocked out synchronized to
external DATACLK .(1) Conversion “n” in process.
CS or R/C must be HIGH or a new conversion will
be initiated without time for acquisition.
Analog circuitry powered. Conversion can proceed.
Analog circuitry disabled. Data from previous
conversion maintained in output registers.
Serial data is output in Binary Two’s Complement
format.
Serial data is output in Straight Binary format.
DESCRIPTION
ANALOG INPUT
Full-Scale Range
±10 ±5 ±3.33V 0V to 5V 0V to 10V
Least Significant Bit (LSB) 4.88mV 2.44mV 1.63mV 1.22mV 2.44mV
+Full Scale (FS – 1LSB) 9.99512V 4.99756V 3.33171V 4.99878V 9.99756V
Midscale
0V
0V
0V
2.5V
5V
One LSB Below Midscale –4.88mV –2.44mV –1.63mV 2.49878V 4.99756V
–Full Scale
–10V
–5V –3.333333V 0V
0V
0V to 4V
0.98mV
3.99902V
2V
1.99902V
0V
DIGITAL OUTPUT
BINARY TWO’S
COMPLEMENT
(SB/BTC LOW)
STRAIGHT BINARY
(SB/BTC HIGH)
HEX
HEX
BINARY CODE CODE BINARY CODE CODE
0111 1111 1111 7FF 1111 1111 1111 FFF
0000 0000 0000 000 1000 0000 0000 800
1111 1111 1111 FFF 0111 1111 1111 7FF
1000 0000 0000 800 0000 0000 0000 000
Table IV. Output Codes and Ideal Input Voltages.
®
ADS7808
6

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