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ADS7831 Schematic ( PDF Datasheet ) - Burr-Brown Corporation

Teilenummer ADS7831
Beschreibung 12-Bit 600kHz Sampling CMOS ANALOG-to-DIGITAL CONVERTER
Hersteller Burr-Brown Corporation
Logo Burr-Brown Corporation Logo 




Gesamt 10 Seiten
ADS7831 Datasheet, Funktion
®
FPOADS7831
ADS7831
ADS7831
12-Bit 600kHz Sampling CMOS
ANALOG-to-DIGITAL CONVERTER
FEATURES
q 600kHz THROUGHPUT RATE
q STANDARD ±2.5V INPUT RANGE
q 69dB min SINAD WITH 250kHz INPUT
q COMPLETE WITH S/H, REF, CLOCK, ETC.
q PARALLEL DATA w/LATCHES
q FULLY SPECIFIED –40°C TO +85°C
q 15MHz –3dB BANDWIDTH
q 28-PIN 0.3" PDIP AND SOIC
DESCRIPTION
The ADS7831 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 inher-
ent S/H, reference, clock, interface for microprocessor
use, and three-state output drivers.
The ADS7831 is specified at a 600kHz sampling rate,
and guaranteed over the full temperature range. A
±2.5V input range and excellent Nyquist performance
provide an optimum solution in ±5V supply systems.
The 28-pin ADS7831 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.
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
0
FREQUENCY SPECTRUM
(16384 Point FFT; fIN = 250kHz, –0.5dB)
THD : –91dB
SNR : 72dB
SFDR : 94dB
2nd Harmonic : –98dB
3rd Harmonic : –94dB
3
2
75 150
225
Frequency (kHz)
SFDR: 94dBc
300
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
© 1994 Burr-Brown Corporation
PDS-1275
1
APDrinSted7in8U3.S1.A. March, 1995
®






ADS7831 Datasheet, Funktion
TYPICAL PERFORMANCE CURVES (CONT)
T = +25°C, fS =600kHz, +VDIG = +VANA = +5V, –VANA = –5V, using internal reference and the 50input resistor shown in Figure 4b, unless otherwise specified.
1
0.5
0
–0.5
All Codes INL
–1
0 512 1024
1536 2048 2560
Decimal Code
3072
3584
4095
1
0.5
0
–0.5
All Codes DNL
–1
0 512 1024
1536 2048 2560
Decimal Code
3072
3584
4095
CODE TRANSITION NOISE
100
75
50
25
0
0 0.25 0.5 0.75 1
Analog Input Voltage – Expected Code Center (LSBs)
D.C. PARAMETERS vs. TEMPERATURE
2
1 Offset Error
0
–1
–2
0.2
0.1 +FS Error
0
–0.1
–0.2
0.2
0.1 –FS Error
0
–0.1
–0.2
–75 –50 –25
0 25 50 75
Temperature (°C)
100 125 150
INTERNAL REFERENCE VOLTAGE vs TEMPERATURE
2.520
2.515
2.510
2.505
2.500
2.495
2.490
2.485
2.480
–75 –50 –25
0 25 50 75 100 125 150
Temperature (°C)
1500
CONVERSION TIME (t7) vs TEMPERATURE
1450
1400
1350
1300
1250
1200
1150
1100
1050
–75 –50 –25
0 25 50 75 100 125 150
Temperature (°C)
®
ADS7831
6

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