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DAC7644E Datasheet ( 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
LOGO Burr-Brown Corporation LOGO 
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DAC7644E 数据手册


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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