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ADC76A Schematic ( PDF Datasheet ) - Burr-Brown Corporation

Teilenummer ADC76A
Beschreibung 16-Bit ANALOG-TO-DIGITAL CONVERTER
Hersteller Burr-Brown Corporation
Logo Burr-Brown Corporation Logo 




Gesamt 8 Seiten
ADC76A Datasheet, Funktion
® ADC76
16-Bit
ANALOG-TO-DIGITAL CONVERTER
FEATURES
q 16-BIT RESOLUTION
q LINEARITY ERROR: ±0.003% max (KG, BG)
q NO MISSING CODES GUARANTEED
FROM –25°C TO +85°C
q 17µs CONVERSION TIME (16-Bit)
q SERIAL AND PARALLEL OUTPUTS
DESCRIPTION
The ADC76 is a high quality, 16-bit successive ap-
proximation analog-to-digital converter. The ADC76
uses state-of-the-art laser-trimmed IC thin-film resis-
tors and is packaged in a hermetic 32-pin dual-in-line
package. The converter is complete with internal ref-
erence, short cycling capabilities, serial output, and
thin-film scaling resistors, which allow selection of
analog input ranges of ±2.5V, ±5V, ±10V, 0 to +5V,
0 to +10V and 0 to +20V.
It is specified for operation over two temperature
ranges: 0°C to +70°C (J, K) and –25°C to +85°C (A, B).
Data is available in parallel and serial form with
corresponding clock and status output. All digital
inputs and outputs are TTL-compatible.
Power supply voltages are ±15VDC and +5VDC.
Parallel
Digital
Output
16-Bit
Successive Approx.
Register (SAR)
16-Bit D/A
Converter
Reference
+
Short Cycle
Convert Command
}Input Range
Select
Comparator In
Clock
Clock Rate Control
Clock Out
Status
Serial Out
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
©1990 Burr-Brown Corporation
PDS-1063A
Printed in U.S.A. December, 1993






ADC76A Datasheet, Funktion
MSB
NC
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Dotted Lines
Are External
Connections
ADC76
+5
2k
32 0.01µF*
31
30
270k
29
28 1.8M
27
Bipolar
26 Offset
25
24
23
22
21
20
19
18
17 Serial Out
Convert Command From
Control Logic
+5VDC
Gain
Adjust
+
10k to
100k
1µF
Offset
Adjust
1µF
10k to
100k
+
1µF
+ 1µF
+15VDC
Analog Input
±10V
Analog
Common
–15VDC
Status Output to
Control Logic
Digital
Common
*Capacitor should be connected even if external gain adjust is not used.
FIGURE 5. ADC76 Connections for: ±10V Analog Input, 14-Bit Resolution (Short-Cycled), Parallel Data Output.
DISCUSSION
OF SPECIFICATIONS
The ADC76 is specified to meet critical performance criteria
for a wide variety of applications. The most critical specifi-
cations for an A/ D converter are linearity, drift, gain and
offset errors, and conversion speed effects on accuracy. This
ADC is factory-trimmed and tested for all critical key
specifications.
GAIN AND OFFSET ERROR
Initial Gain and Offset errors are factory-trimmed to typi-
cally ±0.1% of FSR (±0.05% for unipolar offset) at 25°C.
These errors may be trimmed to zero by connecting external
trim potentiometers as shown in Figures 10 and 11.
DIFFERENTIAL LINEARITY ERROR
Differential linearity describes the step size between transi-
tion values. A differential linearity error of ±0.003% of FSR
indicates that the size of any step may not vary from the ideal
step size by more than 0.003% of Full Scale Range.
ACCURACY VERSUS SPEED
In successive approximation A/ D converters, the conver-
sion speed affects linearity and differential linearity errors.
Conversion speed and its effect on linearity and differential
linearity errors for the ADC76 are shown in Figure 6.
POWER SUPPLY SENSITIVITY
Changes in the DC power supply voltages will affect accu-
racy. The ADC76 power supply sensitivity is specified at
±0.003% of FSR/%VS for the ±15V supplies and ±0.0015%
of FSR/%V for the +5V supply. Normally, regulated power
S
supplies with 1% or less ripple are recommended for use
with this ADC. See Layout Precautions, Power Supply
Decoupling, and Figure 7.
0.01
0.006
Short Cycled to 13 Bits
1/2LSB 14 Bit
Short Cycled to 14 Bits
1/2LSB 13 Bit
0.003
LINEARITY ERROR
Linearity error is not adjustable and is the most meaningful
indicator of A/ D converter accuracy. Linearity is the devia-
tion of an actual bit transition from the ideal transition value
at any level over the range of the A/ D converter.
0.001
10
11 12 13
Conversion Time (µs)
14
FIGURE 6. Linearity Versus Conversion Time.
15
®
ADC76
6

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