TDA8705A Datasheet, PDF (11/16 Pages) NXP Semiconductors – 6-bit high-speed dual Analog-to-Digital Converter ADC

Philips Semiconductors
6-bit high-speed dual Analog-to-Digital
Converter (ADC)
APPLICATION INFORMATION
Product specification
TDA8705A
handbook, full pagewidth
100 nF
5V
input A
input B
100 nF
100 nF
CLA⁽¹⁾
5V
100 nF
100 nF
1 nF ⁽²⁾
C _LB ⁽¹⁾
100 nF
100 nF
100 nF
CLK
V _CCD
DGND
V _RBA
V _RTA
V _IA
AGND
VCCA
V _RMA
DEC
V _IB
V _RTB
V _RBB
V _RMB
1
2
3
4
5
6
7
TDA8705A
8
9
10
11
12
13
14
28 ^D5A
27 ^D4A
26 ^D3A
25 ^D2A
24 ^D1A
23 ^D0A
22 ^OGND
21 ^{V CCO}
20 ^D5B
19 ^D4B
18 ^D3B
17 ^D2B
16 ^D1B
15 ^D0B
MLC377
5V
100 nF
The analog and digital supplies should be separated and decoupled.
V_RT(n), V_RM(n) and V_RB(n) and DEC inputs are decoupled to AGND.
(1) In the event of AC-coupling, C_LA and C_LB values are chosen in accordance with the classical low frequencies cut-off formulae
f_CL = _2-----×-----_π-----_×---1--R----_I---_×-----C----_L- where input resistance R_I is the value measured under DC conditions.
In the event of DC-coupling, C_LA and C_LB capacitors are omitted. The DC biassing and AC modulation signal directly applied to inputs (pin 6 and 11),
must be in the range of V_RT(n) − V_RB(n).
(2) When pin 10 (DEC) is short-circuited to AGND, an external regulator can be connected to V_RT(n) and V_RB(n).
Fig.6 Application diagram.
1996 Jan 12
11