THS7347 Datasheet, PDF (12/28 Pages) Texas Instruments – 3-Channel RGBHV Video Buffer with I2C™ Control, 2:1 Input Mux, Monitor Pass-Through, and Selectable Input Bias Modes

THS7347
SLOS531 – MAY 2007
www.ti.com
PIN CONFIGURATION (continued)
TERMINAL FUNCTIONS
TERMINAL
I/O
NAME
NO.
DESCRIPTION
CH. 1, INPUT A
1
I Video Input Channel 1, Input A
CH. 2, INPUT A
2
I Video Input Channel 2, Input A
CH. 3, INPUT A
3
I Video Input Channel 3, Input A
H-SYNC, INPUT A
4
I Horizontal Sync, Input A
V-SYNC, INPUT A
5
I Vertical Sync, Input A
CH. 1, INPUT B
7
I Video Input Channel 1, Input B
CH. 2, INPUT B
8
I Video Input Channel 2, Input B
CH. 3, INPUT B
9
I Video Input Channel 3, Input B
H-SYNC, INPUT B
10
I Horizontal Sync, Input B
V-SYNC, INPUT B
11
I Vertical Sync, Input B
I²C, A1
17
I
I²C Slave Address Control Bit A1. Connect to V_DD for a logic 1 preset value or GND for a logic 0 preset
value.
I²C, A0
18
I
I²C Slave Address Control Bit A0. Connect to V_DD for a logic 1 preset value or GND for a logic 0 preset
value.
SDA
SCL
PUC
19
I/O
Serial data line of the I²C bus. Pull-up resistor should have a minimum value = 2 kΩ and a maximum
value = 19 kΩ. Pull up to V_DD.
20
I ^{I2C bus clock line. Pull-up resistor should have a minimum value = 2 kΩ and a maximum value = 19 -kΩ.}
Pull up to V_DD.
Power-Up Condition. Connect to GND for all channels disabled upon power-up. Connect to V_DD (logic
21
I high) to set buffer outputs to OFF and monitor outputs ON with ac-bias configuration on Channels 1 to 3
and both H-Sync/V-Sync enabled.
MUX MODE
15
I
Sets the MUX configuration control. Connect to logic low for MUX Select (pin 16) control of the MUX.
Connect to logic high for I²C control of the MUX.
MUX Select
16
I
Controls the MUX selection when MUX MODE (pin 15) is set to logic low. Connect to logic low for MUX
selector set to Input A. Connect to logic high for MUX selector set to Input B.
CH. 1, BUFFER OUTPUT
35, 36
O
Output Channel 1 from either CH. 1, INPUT A or CH. 1, INPUT B. Connect to ADC/Scalar/Decoder. Both
pins should be connected together on the PCB.
CH. 2, BUFFER OUTPUT
31, 32
O
Output Channel 2 from either CH. 2, INPUT A or CH. 2, INPUT B. Connect to ADC/Scalar/Decoder. Both
pins should be connected together on the PCB.
CH. 3, BUFFER OUTPUT
27, 28
O
Output Channel 3 from either CH. 3, INPUT A or CH. 3, INPUT B. Connect to ADC/Scalar/Decoder. Both
pins should be connected together on the PCB.
H-SYNC BUFFER
OUTPUT
25
O Horizontal Sync Buffer Output. Connect to ADC/Scalar H-sync input.
V-SYNC BUFFER
OUTPUT
24
O Vertical Sync Buffer Output. Connect to ADC/Scalar V-sync input.
CH. 1, SAG
45
O
Video Monitor Pass-Through Output Channel 1 SAG Correction pin. If SAG is not used, connect Directly
to CH. 1, OUTPUT pin 46.
CH. 1, OUTPUT
46
O Video Monitor Pass-Through Output Channel 1 from either CH. 1, INPUT A or CH. 1, INPUT B.
CH. 2, SAG
43
O
Video Monitor Pass-Through Output Channel 2 SAG Correction pin. If SAG is not used, connect Directly
to CH. 2, OUTPUT pin 44.
CH. 2, OUTPUT
44
O Video Monitor Pass-Through Output Channel 2 from either CH. 2, INPUT A or CH. 2, INPUT B.
CH. 3, SAG
41
O
Video Monitor Pass-Through Output Channel 3 SAG Correction pin. If SAG is not used, connect Directly
to CH. 3, OUTPUT pin 42.
CH. 3, OUTPUT
42
O Video Monitor Pass-Through Output Channel 3 from either CH. 3, INPUT A or CH. 3, INPUT B.
H-SYNC MONITOR
OUTPUT
40
O Horizontal Sync Monitor Pass-Through Output.
V-SYNC MONITOR
OUTPUT
39
O Vertical Sync Monitor Pass-Through Output.
AGND
6, 12, 13, 26,
30, 34, 37, 47
I
Ground Reference pin for analog signals. Internally, these pins connect to DGND, although it is
recommended to have the AGND and DGND connected to the proper signals for best results.
+VA
29, 33, 38, 48 I Analog Positive Power Supply Input pins. Connect to 2.7 V to 5 V. Must be equal to or greater than VDD.
VDD
22
I Digital Positive Supply pin for I²C circuitry and H-Sync/V-Sync outputs. Connect to 2.7 V to 5 V.
DGND
23
I Digital GND pin for HV circuitry and I²C circuitry.
Schmitt Trigger Adjust
14
I
Defaults to 1.45 V (TTL compatible). Connect to external voltage reference to adjust H-Sync/V-Sync input
thresholds from 0.9 V to 2 V range.
12
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