TDA8785 Datasheet, PDF (12/24 Pages) NXP Semiconductors – 8-bit high-speed analog-to-digital converter with gain and offset controls

Philips Semiconductors
8-bit high-speed analog-to-digital converter
with gain and offset controls
Product specification
TDA8785
Table 1 Output coding and input voltage (typical values; referenced to AGND, V_i(p) − V_i(n) = 1 V (p-p), 0 dB gain, no
offset correction
STEP
BINARY OUTPUT BITS
TWO’S COMPLEMENT OUTPUT BITS
V_i(p) − V_i(n)
D7 D6 D5 D4 D3 D2 D1 D0 D7 D6 D5 D4 D3 D2 D1 D0
Underflo →0.032 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0
w
0
−0.032 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0
1
−
0000000110000001
.
−
................
8
0
0000100010001000
.
−
................
254
−
1111111001111110
255
0.968
1111111101111111
Overflow >0.968 1 1 1 1 1 1 1 1 0 1 1 1 1 1 1 1
Table 2 OF input coding
OF
0
1
open circuit; note 1
Note
1. Use C ≥ 10 pF to DGND.
AD0 to AD7
active, two’s complement
high impedance
active, binary
Table 3 Input coding and DAC output voltages (typical values; referenced to V_CCA regardless of the offset voltage);
V_FSDAC(p) = V_FSDAC(n)
BINARY INPUT DATA
DAC OUTPUT VOLTAGES (V)
CODE
0
1
.
128
.
254
255
DA7
0
0
.
1
.
1
1
DA6
0
0
.
0
.
1
1
DA5
0
0
.
0
.
1
1
DA4
0
0
.
0
.
1
1
DA3
0
0
.
0
.
1
1
DA2
0
0
.
0
.
1
1
DA1
0
0
.
0
.
1
1
DA0
0
1
.
0
.
0
1
Z_L = 10 kΩ
Z_L = 150 Ω
V_DACO(p)
−1.0
−
.
V_DACO(n)
0
−
.
V_DACO(p)
−0.5
−
.
V_DACO(n)
0
−
.
−0.5
−0.5
−0.25 −0.25
.
.
.
.
−
−
−
−
0
−1.0
0
−0.5
1997 Dec 18
12