DATA SHEET
BIPOLAR ANALOG INTEGRATED CIRCUIT
µ
PC1685G
GENERAL PURPOSE 5 V FREQUENCY DOWN-CONVERTER IC
DESCRIPTION
The
µ
PC1685G is Silicon monolithic IC designed for UHF band receiver applications. This IC consists of double
balanced mixer, local oscillator, IF amplifier, and voltage regulator.
The package is 8-pin SOP suitable for high-density surface mount.
FEATURES
• UHF band operation
• Good capability of UHF-varactor diode due to balanced amplifier oscillator
• Supply voltage: 5 V
• Packaged in 8-pin SOP suitable for high-density mounting
APPLICATIONS
• Tuners for TV and VCR
• Receivers for UHF band
ORDERING INFORMATION
Part Number
Package
8-pin plastic SOP (225 mil)
Package Style
Embossed tape 12 mm wide.
Pin 1 indicates pull-out direction of tape.
Qty 2.5 kp/reel.
µ
PC1685G-E1
Remark
To order evaluation samples, please contact your local NEC office. (Part number for sample order:
µ
PC1685G)
Caution Electro-static sensitive devices
The information in this document is subject to change without notice. Before using this document, please
confirm that this is the latest version.
Not all devices/types available in every country. Please check with local NEC representative for
availability and additional information.
Document No. P14483EJ2V0DS00 (2nd edition)
(Previous No. ID-2330)
Date Published October 1999 N CP(K)
Printed in Japan
The mark
shows major revised points.
©
1988, 1999
µ
PC1685G
INTERNAL BLOCK DIAGRAM
8
7
6
5
PIN CONFIGURATION (Top View)
1. OSC base (bypass)
IF Pre
Amp.
1
2
8
7
6
5
2. OSC base (feedback)
3. OSC collector (coupling)
4. V
CC
5. IF output (open collector)
6. GND
OSC
OSC
Buffer
MIX
3
4
REG.
7. RF input1 (bypass)
8. RF input2
1
2
3
4
2
Data Sheet P14483EJ2V0DS00
µ
PC1685G
PIN EXPLANATION
Pin
No.
1
Symbol
OSC base
(bypass)
Function and Explanation
Internal oscillator consists in balance amplifier.
2 pin and 3 pin should be externally equiped
with tank resonater circuit in order to oscillate
with feedback loop.
1 pin should be grounded through coupling
capacitor to 5 pF.
3 pin is defined as open collector. This pin
should be coupled through resistor or chock coil
in order to adjust Q and be supplied voltage. In
case of abnormal oscillation, adjust its Q lower
to stabilize the operation.
V
REF
Equivalent Circuit
3
V
CC
1
2
2
OSC base
(feedback)
to OSC
buffer
amp.
3
OSC
collector
(coupling)
4
5
V
CC
IF output
Supply voltage pin for the IC.
IF output pin.
This pin is assigned for the open collector
output with high impedance dependent on
external inductance.
V
CC
5
V
REF
6
7
GND
RF input 1
(bypass)
GND pin for the IC.
7 pin and 8 pin are inputs for mixer designed as
double balanced type.
Either pin can be assigned for input and another
for ground.
V
CC
to IF
amp.
8
RF input 2
from
OSC
buffer
RF
input
Data Sheet P14483EJ2V0DS00
3
µ
PC1685G
ABSOLUTE MAXIMUM RATINGS
Parameter
Supply Voltage
Power Dissipation
Operating Ambient Temperature
Storage Temperature
Symbol
V
CC
P
D
T
A
T
stg
T
A
= +25 °C
T
A
= +85 °C
Note
Conditions
Rating
6.0
250
−40
to
+85
−65
to
+150
Unit
V
mW
°C
°C
Note
Mounted on 50
×
50
×
1.6-mm epoxy glass PWB, with copper patterning on both sides.
RECOMMENDED OPERATING RANGE
Parameter
Supply Voltage
Operating Ambient Temperature
Symbol
V
CC
T
A
MIN.
4.5
−40
TYP.
5.0
+25
MAX.
5.5
+85
Unit
V
°C
ELECTRICAL CHARACTERISTICS (V
CC
= 5 V, T
A
= +25
°
C)
Parameter
Circuit Current 1
Conversion Gain 1
Symbol
I
CC
1
CG1
Test Conditions
No input signal
f
RF
= 500 MHz, f
IF
= 50 MHz,
P
RF
=
−40
dBm, P
OSC
=
−5
dBm
Note
MIN.
21
9.5
Note
8
−
Note
−
Note
−
Note
−
Note
−2
−
dBm
−2
−
dBm
12.5
15.5
dB
12
14
dB
TYP.
31.5
13.5
MAX.
40
15.5
Unit
mA
dB
Conversion Gain 2
CG2
f
RF
= 900 MHz, f
IF
= 50 MHz,
P
RF
=
−40
dBm, P
OSC
=
−5
dBm
Note
f
RF
= 500 MHz, f
IF
= 50 MHz,
P
OSC
=
−5
dBm
f
RF
= 900 MHz, f
IF
= 50 MHz,
P
OSC
=
−5
dBm
f
RF
= 500 MHz, f
IF
= 50 MHz,
P
RF
= 0 dBm, P
OSC
=
−5
dBm
f
RF
= 900 MHz, f
IF
= 50 MHz,
P
RF
= 0 dBm, P
OSC
=
−5
dBm
Noise Figure 1
NF1
12
15
dB
Noise Figure 2
NF2
Maximum Output Power 1
P
O(sat)
1
Maximum Output Power 2
P
O(sat)
2
Note
By test circuit 1
4
Data Sheet P14483EJ2V0DS00
µ
PC1685G
STANDARD CHARACTERISTICS (FOR REFERENCE) (V
CC
= 5 V, T
A
= +25
°
C unless otherwise specified)
Parameter
Oscillation Frequency Stability
Oscillation Frequency Drift
Oscillation Start Voltage
1 % Cross-modulation Distortion 1
1 % Cross-modulation Distortion 2
Symbol
f
stb
f
drift
V
OSC
CM1
CM2
Test Conditions
V
CC
=
±10
%, f
OSC
= 550 to 950 MHz
f
OSC
= 550 to 950 MHz, 30 min.
f
OSC
= 550 to 950 MHz
f
RF
= 500 MHz
f
RF
= 900 MHz
Note 1
Note 1
Note 1
Note 2, 3
Note 2, 3
Reference Values
±200
150
3.0
86.5
86
Unit
kHz
kHz
V
dB
µ
dB
µ
Notes 1.
By test circuit 2
2.
By test circuit 1
3.
f
undes
= f
RF
±12 MHz, P
RF
=
−31
dBm, f
IF
= 50 MHz, P
OSC
=
−5
dBm
AM: 100 kHz, 30 % Mod., S/I Ratio = 46 dBc, output 75
Ω
open
Data Sheet P14483EJ2V0DS00
5
DSP 与 ARM 处理器
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
