TDA8792 Datasheet, PDF (13/20 Pages) NXP Semiconductors – 3.3 V, 25 MHz 8-bit analog-to-digital converter ADC

Philips Semiconductors
3.3 V, 25 MHz 8-bit
analog-to-digital converter (ADC)
APPLICATION INFORMATION
Product specification
TDA8792
handbook, full pagewidth
3.3 V
3.3 V
100 nF
22 kΩ
3.3 V
100 nF
100 nF
100 nF
100 nF
STDBY
1
V _DDD
2
VSSD2
3
VSSA1 ₄
VI ₅
V _DDA
6
I _bias
7
(1)
VRT
8
(1)
VRM
9
(1)
V _RB
10
(2)
n.c.
11
VSSA2
12
CLK
24
VSSO
23
V _DDO
22
D7
21
3.3 V
100 nF
D6
20
TDA8792
D5
19
D4
18
D3
17
D2
16
D1
15
D0
14
OE
13
MLD128 - 1
The analog and digital supplies should be separated and decoupled.
The external voltage generator must be built such that a good supply voltage ripple rejection is achieved with respect to the LSB value. The reference
ladder voltages can also be derived from a well regulated V_DDA supply through a resistor bridge and a decoupled capacitor.
For applications where the input signal must remain well centred around middle scale, V_RM must be decoupled and connected to analog input signal
(pin 5) through a resistor. The values must be defined in accordance with the input signal frequency in order to avoid direct coupling into the ADC ladder
(e.g. R = 5 kΩ and C = 100 nF).
(1) V_RB, V_RM and V_RT are decoupled to V_SSA.
(2) Pin 11 should be connected to V_SSA in order to prevent noise influence.
Fig.12 Application diagram.
1996 Feb 21
13