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DAC7631EB Schematic ( PDF Datasheet ) - Burr-Brown Corporation

Teilenummer DAC7631EB
Beschreibung Serial Input/ 16-Bit/ Voltage Output DIGITAL-TO-ANALOG CONVERTER
Hersteller Burr-Brown Corporation
Logo Burr-Brown Corporation Logo 




Gesamt 20 Seiten
DAC7631EB Datasheet, Funktion
®
DAC7631 ®
DAC7631
For most current data sheet and other product
information, visit www.burr-brown.com
Serial Input, 16-Bit, Voltage Output
DIGITAL-TO-ANALOG CONVERTER
FEATURES
q LOW POWER: 2.5mW
q UNIPOLAR OR BIPOLAR OPERATION
q SETTLING TIME: 10µs to 0.003%
q 15-BIT LINEARITY AND MONOTONICITY:
–40°C to +85°C
q USER SELECTABLE RESET TO
MID-SCALE OR ZERO-SCALE
q SMALL SSOP-20 PACKAGE
DESCRIPTION
The DAC7631 is a serial input, 16-bit, voltage out-
put Digital-to-Analog Converter (D/A) with guaran-
teed 15-bit monotonic performance over the –40°C to
+85°C temperature range. An asynchronous reset clears
all registers to either mid-scale (8000H) or zero-scale
(0000H), selectable via the RESETSEL pin. The de-
vice can be powered from a single +5V supply or from
dual +5V and –5V supplies.
APPLICATIONS
q ATE PIN ELECTRONICS
q PROCESS CONTROL
q CLOSED-LOOP SERVO-CONTROL
q MOTOR CONTROL
q DATA ACQUISITION SYSTEMS
Low power and small size makes the DAC7631 ideal
for process control, data acquisition systems, and
closed-loop servo-control. The device is available in a
SSOP-20 package, and is guaranteed over the
–40°C to +85°C temperature range.
SDO
VDD
VCC
VSS
VREFL
Sense
VREFL
VREFH
VREFH
Sense
CLK
CS
Shift
Register
SDI
DAC7631
Input
Register
DAC
Register
LOAD
RSTSEL RST
LDAC
DAC A
DGND
VOUT
VOUT Sense
AGND
SBAS122
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-11536A
DPArintCed7in6U3.S.1A. August, 2000
®






DAC7631EB Datasheet, Funktion
TYPICAL PERFORMANCE CURVES: VSS = 0V
At TA = +25°C, VDD = VCC = +5V, VSS = 0V, VREFH = +2.5V, and VREFL = 0V, representative unit, unless otherwise specified.
LINEARITY ERROR AND
DIFFERENTIAL LINEARITY ERROR vs CODE
(+25°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
LINEARITY ERROR AND
DIFFERENTIAL LINEARITY ERROR vs CODE
(+85°C)
2.5
2.0
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
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
LINEARITY ERROR AND
DIFFERENTIAL LINEARITY ERROR vs CODE
(–40°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
ZERO-SCALE ERROR vs TEMPERATURE
(Code 0040H)
2.0
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
–2.0
–40 –30 –20 –10 0 10 20 30 40 50 60 70 80 90
Temperature (°C)
POSITIVE FULL-SCALE ERROR vs TEMPERATURE
(Code FFFFH)
2.0
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
–2.0
–40 –30 –20 –10 0 10 20 30 40 50 60 70 80 90
Temperature (°C)
0.14
VREFH CURRENT vs CODE
0.12
0.10
0.08
0.06
0.04
0.02
0
0000H 2000H 4000H 6000H 8000H A000H C000H E000H FFFFH
Digital Input Code
®
DAC7631
6

6 Page









DAC7631EB pdf, datenblatt
+2.5000V
Serial Data Out
Serial Data In
Clock
Chip Select
1 VREFH
VCC 20
2 VREFH Sense
AGND 19
3 VREFL
VSS 18
4 VREFL Sense
VOUT Sense 17
5 DGND
6 VDD
DAC7631
VOUT 16
NC 15
7 SDO
RSTSEL 14
8 SDI
RST 13
9 CLK
LOAD 12
10 CS
LDAC 11
FIGURE 2. Basic Single-Supply Operation.
+5V
+
0.1µF 1µF
0V to +2.5V
Reset DAC Registers
Load
Load DAC Registers
+5V +2.5000V
+ –2.5000V
0.1µF 1µF
Serial Data Out
Serial Data In
Clock
Chip Select
1 VREFH
VCC 20
2 VREFH Sense
AGND 19
3 VREFL
VSS 18
4 VREFL Sense
VOUT Sense 17
5 DGND
6 VDD
DAC7631
VOUT 16
NC 15
7 SDO
RSTSEL 14
8 SDI
RST 13
9 CLK
LOAD 12
10 CS
LDAC 11
+5V
0.1µF
0.1µF
+ 1µF
+
1µF
–5V
–2.5V to +2.5V
Reset DAC Registers
Load
Load DAC Registers
FIGURE 3. Basic Dual-Supply Operation.
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. When
VSS = 0V (single-supply operation), and with RLOAD also
connected 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 amplifier 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 of only
40m(RW2) will cause a voltage drop of 40µV, as shown in
Figure 4. 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 DAC7631 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 (as shown in Figure 4), thus ensuring an accurate
output voltage.
REFERENCE INPUTS
The reference inputs, VREFL and VREFH, can be any voltage
between VSS + 2.5V and VCC – 2.5V, provided that VREFH
is at least 1.25V greater than VREFL. The minimum output of
each DAC is equal to VREFL plus a small offset voltage
(essentially, the offset of the output op amp). The maximum
output is equal to VREFH plus a similar offset voltage. Note
that VSS (the negative power supply) must either be
connected to ground or must be in the range of –4.75V to
–5.25V. The voltage on VSS sets several bias points within
the converter. If VSS is not in one of these two configura-
tions, the bias values may be in error and proper operation
of the device is not guaranteed.
®
DAC7631
12

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