TDA8767 Datasheet, PDF (10/20 Pages) NXP Semiconductors – 12-bit high-speed Analog-to-Digital Converter ADC

Philips Semiconductors
12-bit high-speed Analog-to-Digital
Converter (ADC)
Preliminary specification
TDA8767
Table 1 Output coding with differential inputs (typical values to AGND); V_I(p-p) − V_I(p-p) = 2.0 V; V_ref = V_CCA − 2 V
CODE
V_I
V_I
IR
BINARY OUTPUTS
D11 to D0
TWO’S COMPLEMENT
OUTPUTS
D11 to D0
underflow <2.0
>3.0
0
0
2.0
3.0
1
1
−
−
1
↓
−
−
↓
2 047
2.5
2.5
1
↓
−
−
↓
4 094
−
−
1
4 095
3.0
2.0
1
overflow
>3.0
<2.0
0
000000000000
000000000000
0 0 0 0 0 0 0 0 0 0 01
↓
011111111111
↓
111111111110
111111111111
111111111111
100000000000
1 0 0 0 0 0 0 0 0 0 00
100000000001
↓
111111111111
↓
011111111110
011111111111
011111111111
Table 2 Output coding with single input (typical values to AGND); V_FS = 2.0 V (p-p); V_ref = V_CCA − 2 V
CODE
underflow
0
1
↓
2 047
↓
4 094
4 095
overflow
V_I
<1.5
1.5
−
−
2.5
−
−
3.5
>3.5
IR
BINARY OUTPUTS
TWO’S COMPLEMENT
OUTPUTS
D11 to D0
D11 to D0
0
000000000000
100000000000
1
000000000000
1 0 0 0 0 0 0 0 0 0 00
1
0 0 0 0 0 0 0 0 0 0 01
100000000001
↓
↓
↓
1
011111111111
111111111111
↓
↓
↓
1
111111111110
011111111110
1
111111111111
011111111111
0
111111111111
011111111111
Table 3 Mode selection
TC
OE
0
0
1
0
X⁽¹⁾
1
Note
1. Where: X = don’t care.
D0 to D11 and IR
binary; active
two’s complement; active
high impedance
Table 4 Sample-and-hold selection
SH
1
active
0
inactive; tracking mode
SAMPLE-AND-HOLD
1999 Feb 16
10