![](http://datasheet.mmic.net.cn/370000/UPD784915A_datasheet_16743933/UPD784915A_72.png)
μ
PD784915A, 784916A
72
DFG amplifier (AC coupling) (T
A
= 25
°
C, V
DD
= AV
DD
= 5 V, V
SS
= AV
SS
= 0 V)
Parameter
Symbol
Condition
MIN.
TYP.
MAX.
Unit
Voltage gain
G
DFG
f
i
= 900 Hz, open loop
50
dB
Feedback resistance
R
FDFG
160
400
640
k
Input protection resistance
R
IDFG
150
High comparator voltage
V
DFGH
V
REF
+ 0.07 V
REF
+ 0.10 V
REF
+ 0.14
V
Low comparator voltage
V
DFGL
V
REF
– 0.14 V
REF
– 0.10 V
REF
– 0.07
V
Caution
Set the input resistance connected to the DFGIN pin to 16 k
or below. Connecting a resistor
exceeding that value may cause the DFG amp to oscillate.
DPG comparator (AC coupling) (T
A
= 25
°
C, V
DD
= AV
DD
= 5 V, V
SS
= AV
SS
= 0 V)
Parameter
Symbol
Condition
MIN.
TYP.
MAX.
Unit
Input impedance
Z
IDPG
20
50
100
k
High comparator voltage
V
DPGH
V
REF
+ 0.02 V
REF
+ 0.05 V
REF
+ 0.08
V
Low comparator voltage
V
DPGL
V
REF
– 0.08 V
REF
– 0.05 V
REF
– 0.02
V
Ternary separation circuit (T
A
= 25
°
C, V
DD
= AV
DD
= 5 V, V
SS
= AV
SS
= 0 V)
Parameter
Symbol
Condition
MIN.
TYP.
MAX.
Unit
Input impedance
Z
IPFG
20
50
100
k
High comparator voltage
V
PFGH
V
REF
+ 0.5 V
REF
+ 0.7
V
REF
+ 0.9
V
Low comparator voltage
V
PFGL
V
REF
– 1.4 V
REF
– 1.2
V
REF
– 1.0
V
CSYNC comparator (AC coupling) (T
A
= 25
°
C, V
DD
= AV
DD
= 5 V, V
SS
= AV
SS
= 0 V)
Parameter
Symbol
Condition
MIN.
TYP.
MAX.
Unit
Input impedance
Z
ICSYN
20
50
100
k
High comparator voltage
V
CSYNH
V
REF
+ 0.07 V
REF
+ 0.10 V
REF
+ 0.13
V
Low comparator voltage
V
CSYNL
V
REF
– 0.13 V
REF
– 0.10 V
REF
– 0.07
V
Reel FG comparator (AC coupling) (T
A
= 25
°
C, V
DD
= AV
DD
= 5 V, V
SS
= AV
SS
= 0 V)
Parameter
Symbol
Condition
MIN.
TYP.
MAX.
Unit
Input impedance
Z
IRLFG
20
50
100
k
High comparator voltage
V
RLFGH
V
REF
+ 0.02 V
REF
+ 0.05 V
REF
+ 0.08
V
Low comparator voltage
V
RLFGL
V
REF
– 0.08 V
REF
– 0.05 V
REF
– 0.02
V
RECCTL driver (T
A
= 25
°
C, V
DD
= AV
DD
= 5 V, V
SS
= AV
SS
= 0 V)
Parameter
Symbol
Condition
MIN.
TYP.
MAX.
Unit
RECCTL+, – high-level output voltage
V
OHREC
I
OH
= –4 mA
V
DD
– 0.8
V
RECCTL+, – low-level output voltage
V
OLREC
I
OL
= 4 mA
0.8
V
CTLDLY internal resistance
R
CTL
40
70
140
k
CTLDLY charge current
I
OHCTL
Use of internal resistor
–3
mA
CTLDLY discharge current
I
OLCTL
–3
mA