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DAC7644E 数据手册 PDF ( 16-Bit/ Quad Voltage Output DIGITAL-TO-ANALOG CONVERTER )

零件编号 DAC7644E
描述 16-Bit/ Quad Voltage Output DIGITAL-TO-ANALOG CONVERTER
制造商 Burr-Brown Corporation
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DAC7644E 数据手册, 描述, 功能
®
DAC7644
DAC7644
For most current data sheet and other product
information, visit www.burr-brown.com
16-Bit, Quad Voltage Output
DIGITAL-TO-ANALOG CONVERTER
FEATURES
q LOW POWER: 10mW
q UNIPOLAR OR BIPOLAR OPERATION
q SETTLING TIME: 10µs to 0.003%
q 15-BIT LINEARITY AND MONOTONICITY:
–40°C to +85°C
q PROGRAMMABLE RESET TO MID-SCALE
OR ZERO-SCALE
q DATA READBACK
q DOUBLE-BUFFERED DATA INPUTS
APPLICATIONS
q PROCESS CONTROL
q CLOSED-LOOP SERVO-CONTROL
q MOTOR CONTROL
q DATA ACQUISITION SYSTEMS
q DAC-PER-PIN PROGRAMMERS
DAC7644
VDD VSS VCC
DESCRIPTION
The DAC7644 is a 16-bit, quad voltage output digital-
to-analog converter with guaranteed 15-bit monotonic
performance over the specified temperature range. It
accepts 16-bit parallel input data, has double-buffered
DAC input logic (allowing simultaneous update of all
DACs), and provides a readback mode of the internal
input registers. Programmable asynchronous reset clears
all registers to a mid-scale code of 8000H or to a zero-
scale of 0000H. The DAC7644 can operate from a single
+5V supply or from +5V and –5V supplies.
Low power and small size per DAC make the DAC7644
ideal for automatic test equipment, DAC-per-pin pro-
grammers, data acquisition systems, and closed-loop
servo-control. The DAC7644 is available in a 48-lead
SSOP package and offers guaranteed specifications
over the –40°C to +85°C temperature range.
VREFL
VREFH
AB Sense VREFL AB VREFH AB AB Sense
DATA I/O
16 I/O
Buffer
Input
Register A
Input
Register B
A1
A0
CS
R/W
Control
Logic
Input
Register C
Input
Register D
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
RST
RSTSEL LOADDACS VREFL VREFL CD VREFH CD VREFH
CD Sense
CD Sense
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/ • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
© 1999 Burr-Brown Corporation
PDS-11535B
PDrintAedCin U7.S6.A4. 4November, 1999
®




DAC7644E pdf, 数据表
TYPICAL PERFORMANCE CURVES: VSS = 0V (CONT)
At TA = +25°C, VDD = VCC = +5V, VSS = 0V, VREFH = +2.5V, VREFL = 0V, representative unit, unless otherwise specified.
ZERO-SCALE ERROR vs TEMPERATURE
2
Code (0040H)
1.5
1
DAC D DAC C
0.5
0
–0.5
DAC A DAC B
–1
–1.5
–2
–40
–25 0
25
Temperature (°C)
55
85
FULL-SCALE ERROR vs TEMPERATURE
2
Code (FFFFH)
1.5
1 DAC B DAC C
0.5
0
–0.5 DAC A DAC D
–1
–1.5
–2
–40
–25 0
25
Temperature (°C)
55
85
0.30
VREFH CURRENT vs CODE
(all DACs sent to indicated code)
0.25
0.20
0.15
0.10
0.05
0.00
0000H 2000H 4000H 6000H 8000H A000H C000H E000H FFFFH
Digital Input Code
0.00
VREFL CURRENT vs CODE
(all DACs sent to indicated code)
–0.05
–0.10
–0.15
–0.20
–0.25
–0.30
0000H 2000H 4000H 6000H 8000H A000H C000H E000H FFFFH
Digital Input Code
POSITIVE SUPPLY CURRENT vs TEMPERATURE
2
Data = FFFFH (all DACs)
No Load
1.5
1
0.5
0
–40
–25 0
25
Temperature (°C)
55
85
POSITIVE SUPPLY CURRENT
vs DIGITAL INPUT CODE
2
No Load
1.5
All DACs
1
One DAC
0.5
0
0000H 0200H 0400H 0800H 1000H 2000H 4000H 6000H 8000H A000H C000H E000H FFFFH
Digital Input Code
®
DAC7644
8


DAC7644E equivalent, schematic
Data
Bus
+5V
Reset DACs
Load DAC Registers
READ/WRITE
Address
Chips Select
1 DB15
NC 48
2 DB14
NC 47
3 DB13
NC 46
4 DB12
NC 45
5 DB11
VOUTA Sense 44
6 DB10
VOUTA 43
7 DB9
VREFL AB Sense 42
8 DB8
VREFL AB 41
9 DB7
VREFH AB 40
10 DB6
VREFH AB Sense 39
11 DB5
VOUTB Sense 38
12 DB4
13 DB3
DAC7644
VOUTB
VOUTC Sense
37
36
14 DB2
VOUTC 35
15 DB1
VREFH CD Sense 34
16 DB0
VREFH CD 33
17 RSTSEL
VREFL CD 32
18 RST
VREFL CD Sense 31
19 LOADDACS
VOUTD Sense 30
20 R/W
VOUTD 29
21 A1
VSS 28
22 A0
AGND 27
23 CS
24 DGND
VCC 26
VDD 25
NC = No Connection
FIGURE 3. Basic Dual-Supply Operation of the DAC7644.
–2.5V to +2.5V
–2.5V
+2.5V
–2.5V to +2.5V
–2.5V to +2.5V
+2.5V
–2.5V
–2.5V to +2.5V
0.1µF + 1.0µF
0.1µF + 1.0µF
–5V
+5V
ANALOG OUTPUTS
When VSS = –5V (dual supply operation), the output ampli-
fier can swing to within 2.25V of the supply rails, guaran-
teed over the –40°C to +85°C temperature range. With VSS
= 0V (single-supply operation), and with RLOAD also con-
nected to ground, the output can swing to ground. Care must
also be taken when measuring the zero-scale error when VSS
= 0V. Since the output voltage cannot swing below ground,
the output voltage may not change for the first few digital
input codes (0000H, 0001H, 0002H, etc.) if the output ampli-
fier has a negative offset. At the negative limit of –2mV, the
first specified output starts at code 0040H.
Due to the high accuracy of these D/A converters, system
design problems such as grounding and contact resistance
become very important. A 16-bit converter with a 2.5V full-
scale range has a 1LSB value of 38µV. With a load current
of 1mA, series wiring and connector resistance (see Figure
4) of only 40m(RW2) will cause a voltage drop of 40µV.
To understand what this means in terms of a system layout,
the resistivity of a typical 1 ounce copper-clad printed circuit
board is 1/2 mper square. For a 1mA load, a 10 milli-inch
wide printed circuit conductor 600 milli-inches long will
result in a voltage drop of 30µV.
The DAC7644 offers a force and sense output configuration
for the high open-loop gain output amplifier. This feature
allows the loop around the output amplifier to be closed at
the load (see Figure 4), thus ensuring an accurate output
voltage.
NC 48
NC 47
NC 46
NC 45
VOUTA Sense
DAC7644
VOUTA
VREFL AB Sense
VREFL AB
VREFH AB
VREFH AB Sense
VOUTB Sense
VOUTB
44
43
42
41
40
39
38
37
RW1
RW2
RW1
RW2
VOUT
+V
+2.5V
VOUT
FIGURE 4. Analog Output Closed-Loop Configuration
(1/2 DAC7644). RW represents wiring resis-
tances.
®
DAC7644
16



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