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PDF ( 数据手册 , 数据表 ) DAC7634E

零件编号 DAC7634E
描述 16-BIT/ QUAD VOLTAGE OUTPUT DIGITAL-TO-ANALOG CONVERTER
制造商 Burr-Brown Corporation
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DAC7634E 数据手册, 描述, 功能
BurrĆBrown Products
from Texas Instruments
DAC7634
SBAS134A – JULY 2004 – REVISED AUGUST 2004
16-BIT, QUAD VOLTAGE OUTPUT
DIGITAL-TO-ANALOG CONVERTER
FEATURES
Low Power: 10 mW
Unipolar or Bipolar Operation
Settling Time: 10 µs to 0.003%
15-Bit Linearity and Monotonicity:
–40°C to 85°C
Programmable Reset to Mid-Scale
or Zero-Scale
Double-Buffered Data Inputs
APPLICATIONS
Process Control
Closed-Loop Servo-Control
Motor Control
Data Acquisition Systems
DAC-Per-Pin Programmers
DAC7634
VDD
VSS
VCC
SDI
SDO
Shift
Register
Input
Register A
Input
Register B
CS
CLOCK
RST
RESTSEL
LDAC
LOAD
Control
Logic
Input
Register C
Input
Register D
DESCRIPTION
The DAC7634 is a 16-bit, quad voltage output, digital-
to-analog converter with specified 15-bit monotonic
performance over the specified temperature range. It
accepts 24-bit serial input data, has double-buffered
DAC input logic (allowing simultaneous update of all
DACs), and provides a serial data output for
daisy-chaining multiple DACs. Programmable asyn-
chronous reset clears all registers to a mid-scale
code of 8000H or to a zero-scale of 0000H. The
DAC7634 can operate from a single 5-V supply or
from 5-V and –5 V supplies.
Low power and small size per DAC make the
DAC7634 ideal for automatic test equipment,
DAC-per-pin programmers, data acquisition systems,
and closed-loop servo-control. The DAC7634 is avail-
able in a 48-lead SSOP package and offers specifi-
cations over the –40°C to 85°C temperature range.
VREF L
VREF H
AB Sense VREFL AB VREFH AB AB Sense
DAC
Register A
DAC
Register B
DAC
Register C
DAC
Register D
DAC A
DAC B
DAC C
DAC D
VOUTA
VOUTA Sense
VOUTB
VOUTB Sense
VOUTC
VOUTC Sense
VOUTD
VOUTD Sense
AGND
DGND
VREF L VREFL CD VREFH CD VREFH
CD Sense
CD Sense
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2004, Texas Instruments Incorporated







DAC7634E pdf, 数据表
DAC7634
SBAS134A – JULY 2004 – REVISED AUGUST 2004
TYPICAL PERFORMANCE CURVES: VSS = 0 V (continued)
At TA = 25°C, VDD = VCC = 5 V, VREFH = 2.5 V, VREFL = 0 V, representative unit, unless otherwise specified.
www.ti.com
LINEARY ERROR AND
DIFFERENTIAL LINEARITY ERROR vs CODE
(DAC A, 85°C)
2.0
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
–2.0
2.0
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
–2.0
0000H
2000H
4000H 6000H
8000H
A000H C000H
E000H FFFFH
Digital Input Code
Figure 5.
LINEARY ERROR AND
DIFFERENTIAL LINEARITY ERROR vs CODE
(DAC B, 85°C)
2.0
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
–2.0
2.0
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
–2.0
0000H
2000H
4000H
6000H
8000H
A000H C000H
E000H FFFFH
Digital Input Code
Figure 6.
LINEARY ERROR AND
DIFFERENTIAL LINEARITY ERROR vs CODE
(DAC C, 85°C)
2.0
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
–2.0
2.0
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
–2.0
0000H
2000H
4000H 6000H
8000H
A000H C000H
E000H FFFFH
Digital Input Code
Figure 7.
LINEARY ERROR AND
DIFFERENTIAL LINEARITY ERROR vs CODE
(DAC D, 85°C)
2.0
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
–2.0
2.0
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
–2.0
0000H
2000H
4000H 6000H
8000H
A000H C000H
E000H FFFFH
Digital Input Code
Figure 8.
8







DAC7634E equivalent, schematic
DAC7634
SBAS134A – JULY 2004 – REVISED AUGUST 2004
TYPICAL PERFORMANCE CURVES: VSS = –5 V (continued)
At TA = 25°C, VDD = VCC = 5 V, VREFH = 2.5 V, VREFL = 0 V, representative unit, unless otherwise specified.
www.ti.com
VOUT vs RLOAD
Source
POSITIVE SUPPLY CURRENT
vs DIGITAL INPUT CODE
2
No Load
1.5
All DACs
One DAC
1
–2
–3
–4
–5
0.001
0.01
Sink
0.1 1 10
RLOAD (k)
Figure 44.
100 1000
OUTPUT VOLTAGE vs SETTLING TIME
(–2.5 V TO 2.5 V)
Large−Signal Settling Time: 1V/div
+5V
LDAC
0
0.5
0
0000H
2000H
4000H
6000H 8000H A000H C000H
Digital Input Code
E000H
FFFFH
Figure 45.
OUTPUT VOLTAGE vs SETTLING TIME
(2.5 V TO –2.5 V)
+5V
LDAC
0
Small−Signal Settling Time: 2LSB/div
Small−Signal Settling Time:
2LSB/div
Large−Signal Settling Time: 1V/div
Time (2 µs/div)
Figure 46.
Time (2 µs/div)
Figure 47.
THEORY OF OPERATION
The DAC7634 is a quad voltage output, 16-bit digi-
tal-to-analog converter (DAC). The architecture is an
R-2R ladder configuration with the three MSBs seg-
mented, followed by an operational amplifier that
serves as a buffer. Each DAC has its own R-2R
ladder network, segmented MSBs, and output oper-
ational amplifier, as shown in Figure 48. The mini-
mum voltage output (zero-scale) and maximum volt-
age output (full-scale) are set by the external voltage
references (VREFL and VREFH, respectively).
The digital input is a 24-bit serial word that contains a
2-bit address code for selecting one of four DACs, a
quick load bit, five unused bits, and the 16-bit DAC
code (MSB first). The converters can be powered
from either a single 5-V supply or a dual ±5-V supply.
The device offers a reset function which immediately
sets all DAC output voltages and DAC registers to
mid-scale code 8000H or to zero-scale, code 0000H.
See Figure 49 and Figure 50 for the basic operation
of the DAC7634.
16










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