AMG-SO204 Datasheet, PDF (6/30 Pages) alpha microelectronics gmbh – Optical Switch IC

AMG-SO204
Optical Switch IC
5.3. Unity Gain Buffer (OA3)
The cell OA3 is used as a buffer and provides the separation between the output of the VGA
and the input of the ADC block. It ensures short settling times during sampling.
5.4. ADC Block
The ADC block consists of three successive approximation (SAR) analog to digital converters.
It requires a reference voltage signal. The reference voltage (VREF) is generated within the
IC. To achieve sampling rates of up to 2MS/s three lower throughput ADCs are combined into
one virtual ADC. The digital block controls the individual ADCs in such a way that their offsets
are compensated for.
5.5. I/O Block
The I/O block provides an interface between the 2.5V logic core and the 3.3V IO voltage.
5.6. Logic Block
The logic block provides digital processing of the sampled signal available at the output of the
variable gain amplifier. The built-in logic interface shown in Fig. 5 controls the sampling action
and proper data transmission between the ADC's and the logic block.
CLK1
RES1
TUN1
SOC1
EOC1
DAT1
CLK2
RES2
TUN2
SOC2
EOC2
DAT2
CLK3
RES3
TUN3
SOC3
EOC3
DAT3
ADC
Interface
1
10
ADC
Interface
2
10
ADC
Interface
3
10
GAIN
3
OA1ENAB
Figure 3 Logic Blocks
Digital Block
Functional Test Mode Interface
ATM
X110 Top
AZERO
Transmit
ASTART
10
ADAT
INCLK
RESIN
COMRXD
COMTXD
EXTOUT[1:0]
EXTINP
NPN
EXTCOVER
LIGHTOUT
3
GAIN
4
EVPORT
CPU async.
Interface
8
Peripheral
8
Blocks
CPURXD
CPUTXD
ROW
SEG
LIGHTENAB
LIGHTPWM
AMG-SO204 Revision: A
29. Jul. 2010 © All rights reserved Page 6 of 30