- SS-HQ1 Application Notes -
Ver.1.0.0 January 7, 2005
16
3.5. EVR Connection
3.5.1. Integrated EVR and Reserved Channels (AGC control)
The CXD3172AR is equipped with a 3-channel, 8-bit D/A converter (EVR).
It can produce nearly linear voltage up to approximately 0V-3.3V.
Table 3.5-1 System Configuration of Integrated EVR
ch
Pin
Parameter
Control details
Control method
EVR0
63
AGCCNT
CAT8_Byte3_bit0-7
AGC gain control
Field-controlled
User-adjusted
EVR1 64 IRISVCNT CAT8_Byte4_bit0-7 Control parameter value of EVR1
User-adjusted
EVR2
66
EVR2CNT
CAT8_Byte5_bit0-7
Control parameter value of EVR2
User-adjusted
We recommend connecting EVR0 (Pin 63) to AGCCONT (Pin 14) of the CXA2096N unless an external
microcomputer or other means is used for AGC because AGC of the CXA2096N is performed by the
CXD3172AR firmware. EVR0 output can be controlled on a per-field basis.
EVR1 and EVR2 (Pins 64 and 66, respectively) are not controlled by the firmware.
The output value of the integrated EVR is as follows. (This is a reference value.)
Fig 3.5-1 Measured EVR Output Value (Reference Value)
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
0
20
40
60
80
A0
C0
E0
EVR data(HEX)
Vo
lta
g
e
(V)
VDD=3.3V