TDA8798HL Philips Semiconductors, TDA8798HL Datasheet - Page 24

• Manufacturer Part Number: TDA8798HL
• Description: Dual 8-bit/ 100 Msps A/D converter with DPGA
• Manufacturer: Philips Semiconductors

Philips Semiconductors
TEST AND APPLICATION INFORMATION
2001 Feb 14
Dual 8-bit, 100 Msps A/D converter with optional DPGA
handbook, full pagewidth
Analog and digital supplies must be separate and decoupled.
(1) Supply decoupling capacitor must be placed as closely as possible to the chips pin. The value may need changing, depending on the external filter
(2) Capacitor may be replaced when an external filter is used with AC coupling.
(3) Capacitor value may be changed to adjust settling time between DPGA gain changes. If no application constraint exists on this settling time, it is
(4) Capacitor value may need changing, depending on the high-pass cut-off frequency of the external filter.
(5) Capacitor must be placed as closely as possible to the chips pin.
characteristics.
recommended to increase this value up to 1nF to have the best DPGA dynamic performance.
3.3 V
V IN2N
V IN1N
3.3 V
V IN2
V IN1
V SSA
V SSA
V SSA
V SSA
100 nF
100 nF
(2)
(2)
100 nF
100 nF
100 nF
100 nF
68 pF
68 pF
100 nF
100 nF
(3)
(3)
(4)
(4)
(4)
(4)
(1)
(1)
100 nF
100 nF
DPGA2N
DPGAC2
DPGAC1
DPGA1N
DPGA2
DPGA1
V DDA2
V DDA1
(2)
V SSA1
(2)
V SSA2
VIN2N
VIN1N
V ref2
V ref1
VIN2
VIN1
10
11
12
13
14
15
16
2
3
4
5
6
7
8
9
1
V SSA
V SSA
100 nF
100 nF
Fig.19 Application diagram.
(1)
(1)
3.3 V
3.3 V
V SSD
V SSD
V SSA
V SSA
33 pF
33 pF
220 k
220 k
(5)
(5)
24
CLK2
CLK1
TDA8798HL
V SSD
V SSD
3.3 V
3.3 V
100 nF
100 nF
V SSD
(1)
(1)
V SSD
V SSD
3.3 V
3.3 V
100 nF
100 nF
V SSO
V SSO
(1)
(1)
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
Product specification
V SSO
V SSO
B7
B6
B5
B4
B3
B2
B1
A0
A1
A2
A3
A4
A5
A6
A7
B0
MGM867
TDA8798
B7
B6
B5
B4
B3
B2
B1
A0
A1
A2
A3
A4
A5
A6
A7
B0