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DAC8734_091 Datasheet, PDF (27/41 Pages) Texas Instruments – Quad, 16-Bit, High-Accuracy, ±16V Output, Serial Input DIGITAL-TO-ANALOG CONVERTER
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DAC8734
www.ti.com .................................................................................................................................................. SBAS465A – MAY 2009 – REVISED SEPTEMBER 2009
Monitor Register. Default = 0000h.
The Monitor Register selects one of the four DAC outputs or the external signal AIN that is to be monitored
through the VMON pin. Only one bit can be set to '1' at a time. When all bits = '0', the monitor is disabled and
VMON is placed in a high-impedance state. The default value after power-on or reset is 0000h.
DB15
0
0
0
0
1
0
DB14
0
0
0
1
0
0
DB13
0
0
1
0
0
0
Table 5. Monitor Register
DB12
0
1
0
0
0
0
DB11
1
0
0
0
0
0
DB10:DB0
Reserved (1)
Reserved (1)
Reserved (1)
Reserved (1)
Reserved (1)
Reserved (1)
VMON CONNECTS TO
AIN
DAC-0
DAC-1
DAC-2
DAC-3
Monitor disabled, Hi-Z (default)
(1) Writing to a reserved bit has no effect; reading the bit returns '0'.
Input Data Register for DAC-n (where n = 0, 1, 2, or 3). Default = 0000h.
This register stores the DAC data written to the device. When the data are loaded into the corresponding DAC
latch, the DAC output changes to the new level defined by the DAC data. The default value after power-on or
reset is 0000h.
For bipolar operation, the input data format is always twos complement. For unipolar operation, the input data
format is always straight binary.
Table 6. DAC-n(1) Input Data Register
MSB
DB15(2) DB14 DB13 DB12 DB11 DB10 DB9
D15
D14 D13 D12 D11 D10 D9
DB8
D8
DB7
D7
DB6
D6
DB5
D5
DB4
D4
DB3
D3
DB2
D2
DB1
D1
LSB
DB0
D0
(1) n = 0, 1, 2, or 3.
(2) D15:D0 are the DAC data bits.
Table 7. DAC Output vs Twos Complement Code for Bipolar Output Operation
TWOS COMPLEMENT CODE
7FFFh
••• •••
0001h
0000h
FFFFh
••• •••
8000h
OUTPUT
+0.5 × Gain × VREF × (32767/32768)
••• •••
+0.5 × Gain × VREF × (1/32768)
0
–0.5 × Gain × VREF × (1/32768)
••• •••
–0.5 × Gain × VREF × (32768/32768)
DESCRIPTION
+Full-Scale – 1 LSB
••• •••
+1 LSB
Zero
–1 LSB
••• •••
–Full-Scale
Table 8. DAC Output vs Straight Binary Code for Unipolar Output Operation
STRAIGHT BINARY CODE
FFFFh
••• •••
8000h
7FFFh
••• •••
0000h
OUTPUT
Gain × VREF × (65535/65536)
••• •••
Gain × VREF × (32768/65536)
Gain × VREF × (32767/65536)
••• •••
0
DESCRIPTION
+Full-Scale – 1 LSB
••• •••
1/2 Full-Scale
1/2 Full-Scale – 1 LSB
••• •••
Zero
Copyright © 2009, Texas Instruments Incorporated
Product Folder Link(s): DAC8734
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