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MP7643 Datasheet(PDF) 6 Page - Exar Corporation

Part No. MP7643
Description  4-Channel, Programmable Gain Voltage Output, 15 MHz Input Bandwidth 8-Bit DACs with Multiplying Parallel Digital Data Port
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Maker  EXAR [Exar Corporation]
Homepage  http://www.exar.com
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MP7643 Datasheet(HTML) 6 Page - Exar Corporation

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MP7643
6
Rev. 1.00
Figure 1. Timing Diagram
tAS
tAH
tDS
tDH
1/2 LSB
1/2 LSB
A1, A0
DB0 to DB7
LD
VOUT
tLD
tSD
2-4
Decoder
A0, A1
LD
To DAC1 Latch Enable
To DAC2 Latch Enable
To DAC3 Latch Enable
To DAC4 Latch Enable
Figure 2. Input Control Logic (Simplified)
Block Diagram
L
L
L
DAC1 Transparent
L
L
DAC1 Latched
L
L
H
DAC2 Transparent
L
H
DAC2 Latched
L
H
L
DAC3 Transparent
H
L
DAC3 Latched
L
H
H
DAC4 Transparent
H
H
DAC4 Latched
H
X
X
No Operation
LD
A1
A0
Operation
Table 1. Truth Table
D7
D6
D5
D4
D3
D2
D1
D0
MSB
LSB
DAC Output Voltage
VOi = VREFN + (VRi – AGND) (
)
D
256
0000
0
0
00
(
1
)
256
1111
1
1
10
1111
1
1
11
000
Table 2. DAC Transfer Function
Analog Output vs. Digital Code (With VREF Shorted to INV)
00
00
1
(VRi – VREFN)+ VREFN
()
256
(VRi – VREFN)+ VREFN
()
256
(VRi – VREFN)+ VREFN
255
254
VREFN
Note: These outputs must be ratioed up for gain in the output amplifier.


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