11
DHT-500SD
SP3721A Terminal Function
SP3721A (
ME
:
U
2)
Description
Pin No.
Pin Name
Type
1, 2
DVDREP, DVDREN
I
RF Signal Inputs. Differential RF signal attenuator input pins
63
CDRF
I
RF Signal Inputs. Single-ended RF signal attenuator input pin
59, 60
AIP, AIN
I
AGC Amplifier Inputs. Differential AGC amplifier input pins
53, 54
DIP, DIN
I
Analog inputs for RF Single Buffer. Differential analog inputs to the RF single-ended output buffer
and full wave rectifier
32
FDCHG#
I
Low Impedance Enable. A TTL compatible input pin that activates the FDCHG switches. A low
level activates the switches and the falling edge of the internal FDCHG triggers the fast decay for
the MIRR bottom hold circuit. (open high)
49
HOLD1
I
Hold Control. A TLL compatible control pin which, when pulled high, disables the RF AGC charge
pump and holds the RF AGC amplifier gain at its present value. (open high)
I
Photo Detector Interface Inputs. Inputs from the main beam Photo detector matrix outputs
I
Photo Detector Interface Inputs. AC coupled inputs for the DPD from the main beam Photo
detector matrix outputs
I
CD tracking Error Inputs. Inputs from the CD photo detector error outputs.
I
CD Photo detector Interface Inputs. Inputs from the CD photo detector error outputs
I
Mirror Envelope Inputs. The SIGO envelope input pin
I
RF signal Input for Mirror. AC coupled inputs for the mirror detection circuit from the pull-in signal
output. (PI)
I
APC Input. DVD APC input pin from the monitor photo diode
I
APC Input. CD APC input pin from the monitor photo diode
25
LDON#
I
APC Output On/Off. APC output control pin. A low level activates the LD output. (open high)
61, 62
ATON/ATOP
O
Differential Attenuator Output. Attenuator outputs
51, 52
FNN, FNP
O
Differential Normal Output. Filter normal outputs
57
SIGO
O
Single Ended Normal Output. Single-ended RF output
64
CDRFDC
O
CD RF Signal Output. Single ended CD RF summing output
42
FE
O
Focusing Error Signal Output. Focus error output reference to VCI
41
TE
O
Tracking Error Signal Output. Tracking error output reference to VCI
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
MLPF
MEVO
MIN
PI
DFT
TPH
MEV
MEI
TE
FE
CE
LCN
LCP
SCLK
SDATA
SDEN
E
F
A
B
C
D
CN
CP
D2
C2
B2
A2
PD2
PD1
DVDRFN
DVDRFP
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
HOLD1
VNA
FNN
FNP
DIP
DIN
RX
BY
P
SIGO
VP
A
AIP
AIN
AT
O
N
AT
O
P
CDRF
CDRDDC
FDCHG#
VIB
VIP
VIIRR
VPB
VCI
VC
LDON#
CDLD
CDPD
DVDLD
DVDPD
VNB
NC
VCI2
CDTE
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