DAC7800 Datasheet, PDF (3/17 Pages) Texas Instruments – Dual Monolithic CMOS 12-Bit Multiplying DIGITAL-TO-ANALOG CONVERTERS

AC PERFORMANCE
OUTPUT OP AMP IS OPA602.
At V_DD = +5VDC, V_{REF A} = V_{REF B} = +10V, T_A = +25°C, unless otherwise noted. These specifications are fully characterized but not subject to test.
DAC7800, 7801, 7802K
DAC7800, 7801, 7802L
PARAMETER
CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
OUTPUT CURRENT SETTLING TIME
DIGITAL-TO-ANALOG GLITCH IMPULSE
AC FEEDTHROUGH
OUTPUT CAPACITANCE
To 0.01% of Full-Scale
R_L = 100Ω, C_L = 13pF
V_{REF A} = V_{REF B} = 0V
R_L = 100Ω, C_L = 13pF
f_VREF = 10kHz
DAC Loaded with All 0s
DAC Loaded with All 1s
0.4
0.8
0.9
–75
–72
30
50
70
100
✻
✻
✻
✻
✻
✻
✻
✻
✻
µs
nV-s
dB
pF
pF
CHANNEL-TO-CHANNEL ISOLATION
V_{REF A} to I_{OUT B}
f_{VREF A} = 10kHz
–90
–94
✻
✻
dB
V_{REF B} = 0V,
Both DACs Loaded with 1s
V_{REF B} to I_{OUT A}
f_{VREF B} = 10kHz
–90
–101
✻
✻
dB
V_{REF A} = 0V,
Both DACs Loaded with 1s
DIGITAL CROSSTALK
Full-Scale Transition
0.9
R_L = 100Ω, C_L = 13pF
✻ Same specification as for DAC7800, 7801, and 7802K.
NOTE: (1) Ensured but not tested.
✻
nV-s
DAC7800
BLOCK DIAGRAM
V_DD
12
DAC7800
Bit 0
Bit 11
Bit 12
Bit 23
12
DAC B Register
12
DAC B
DAC A
12
DAC A Register
12
587
11
CLK CS Data CLR
In
9
DGND
10 UPD B
15 I _{OUT B}
16 AGND B
14 R_{FB B}
13 V _{REF B}
4 V_{REF A}
3 R _{FB A}
2 I _{OUT A}
1 AGND A
6 UPD A
PIN CONFIGURATION
Top View
DIP
AGND A ¹
I_{OUT A} ²
R_{FB A} ³
V_{REF A} ⁴
CLK ⁵
UPD A ⁶
Data In ⁷
CS ⁸
DAC7800
16 AGND B
15 I_{OUT B}
14 R_{FB B}
13 V_{REF B}
12 V_DD
11 CLR
10 UPD B
9 DGND
LOGIC TRUTH TABLE
CLK UPD A UPD B CS CLR FUNCTION
X
X
X
X
0
All register contents set to 0’s (asynchronous).
X
X
X
1
X
No data transfer.
X
X
0
1
Input data is clocked into input register (location Bit 23) and previous data shifts.
X
0
1
0
1
Input register bits 23 (LSB) - 12 (MSB) are loaded into DAC A.
X
1
0
0
1
Input register bits 11 (LSB) - 0 (MSB) are loaded into DAC B.
X
0
0
0
1
Input register bits 23 (LSB) - 12 (MSB) are loaded into DAC A, and input register bits 11 (LSB) - 0 (MSB)
are loaded into DAC B.
X = Don’t care. means falling edge triggered.
DAC7800, 7801, 7802
3
SBAS005A
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