Sony CXA1851N Datasheet
CXA1851N
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Up/Down Converter for 900 MHz-Band Mobile Communications
Description
The CXA1851N is an up/down converter IC for
900 MHz-band mobile communications.
This is suitable for 900 MHz-band digital cordless
telephone (CT2) and digital cellular.
Features
• Transmission/reception converter on a single chip
• Operating frequency: 800 to 900 MHz
• Supply voltage: 2.7 to 4.5 V
• Power saving function
• 20-pin SSOP package used for set size reduction
Applications
• CT2 digital cordless telephone
• Digital cellular
Structure
Bipolar silicon monolithic IC
20 pin SSOP (Plastic)
Absolute Maximum Ratings (Ta=25°C)
• Supply voltage Vcc 5 V
• Operating temperature Topr –20 to +75 °C
• Storage temperature Tstg –65 to +150 °C
• Allowable power dissipation
PD 530∗ mW
∗ When mounted on a 505×0×1.6 mm copper-
foiled glass epoxy board
Recommended Operating Conditions
Supply voltage Vcc 2.7 to 4.5 V
Block Diagram and Pin Configuration
Vcc (D)
IF OUT
IF AMP
MIX
1 2 3 4 5 6 7 8 9 10
GND
LO IN (D)
LNA
RF b
RF IN
LO b (U)
LO b (D)
AMP
OS C B UFFER
REG
OUT
P/S (D)
PEAKING
IF IN
LO IN (U)
RF AMP
REG
P/S (U)
IF b
MIX
RF PRE AMP
Vcc (U)
RF OUT
MIX O UT 2
GND
111213141516171820 19
GND
MIX O UT 1
Sony reserves the right to change products and specifications without prior notice. This information does not convey any license by
any implication or otherwise under any patents or other right. Application circuits shown, if any, are typical examples illustrating the
operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits.
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E93505-TE
Pin Description
CXA1851N
Pin No. Symbol Equivalent circuit Description
voltage (V)
1 GND 0.0 GND pin for the down converter.
2 RF BYPASS 1.1 MIX input by-pass pin for the down
converter.
3 RF INPUT 0.9 RF input pin for the down
converter. Because of high
Typical pin
REG
impedance, a 4.7 nH external chip
inductor should be used for
2
4 PEAKING 0.12 Emitter pin for the low-noise
3
4
OUT amplifier. Connect an approximate-
impedance matching.
REG
ly 3 pF chip capacitor and an
approximately 22Ω chip resistor in
series to the GND.
5 P/S 0 to 4.5 Power saving control pin for the
(for DOWN down converter.
CONV.) OFF when Vp/s≤1.0 V; ON when
Vp/s≥1.8 V
5
6 P/S 0 to 4.5 Power saving control pin for the up
6
(for UP converter.
CONV.) OFF when Vp/s≤1.0 V; ON when
Vp/s≥1.8 V
7VCC 2.7 to 4.5 Power supply for the up converter.
(for Up
CONV.)
REG
8
8 RF OUTPUT 2.7 RF output pin for the up converter.
(Vcc=2.7V) Connect this pin to the Pin 7 power
supply via the 15 nH chip inductor.
9 GND 0.0 GND pin for the up converter RF
amplifier.
—2—
CXA1851N
Pin No. Symbol Equivalent circuit Description
10 MIX OUT1 2.3 MIX output pin for the up
Typical pin
voltage (V)
10 11
converter.
11 MIX OUT2 2.3 MIX output pin for the up
converter. Connect an approximately 4.7 nH chip inductor and
an approximately 3.5 pF chip
capacitor between this pin and
Pin 10 to form a tank circuit.
12 GND 0.0 GND pin for the oscillator buffer
amplifier and mixer blocks of the
up converter.
13 IF BYPASS 1.03 IF input by-pass pin for the up
converter.
14 IF INPUT 1.03 IF input pin for the up converter.
Because of high impedance, an
1314
external matching circuit is
necessary which consists of a 220
nH chip inductor and an
REG
approximately 1.5 pF chip
capacitor.
15 OSC INPUT 1.8 Oscillator input pin for the up
(for UP converter. A matching circuit
CONV.) consisting of a 51Ω resistor is
necessary.
16 OSC 1.8 Oscillator input by-pass pin for the
BYPASS up converter.
(for UP
CONV.)
15 16
1718
17 OSC 1.85 Oscillator input by-pass pin for the
BYPASS down converter.
(for DOWN
CONV.)
18 OSC 1.85 Oscillator input pin for the down
BYPASS converter. A matching circuit
(for DOWN consisting of a 51Ω resistor is
CONV.) necessary.
19 Vcc 2.7 to 4.5 Power supply for the down
(for DOWN converter.
CONV.)
20
20 IF OUTPUT 1.45 IF output pin for the down
converter.
—3—
CXA1851N
Electrical Characteristics
(Ta=25°C, VCC=2.7V, ZL=ZS=50Ω)
Item Symbol Conditions Min. Typ. Max. Unit
Up Converter Block ∗1
Current consumption ICC For no signal input 18.0 25.0 35.0 mA
Conversion gain CG Pin= - 40dBm 17.5 20.5 25.5 dB
RF output power Pout Pin= -10dBm, 50Ω load 0 3 dBm
Noise figure NF DSB mode 13 18 dB
Lo leak ISO (Lo) Pin= - 10dBm - 25.0 - 10 dBm
IF leak ISO (IF) Pin= - 10dBm - 12.0 - 5 dBm
Standby current consumption ICC (PD) 6pin (P/S)<1.0V 220 ∗2 350 ∗2µA
Power saving control voltage Vp/s (ON) 1.8 4.5 V
Vp/s (OFF) 1.0 V
Rise time Tup 2.5 5.0 µs
Down Converter Block ∗3
Current consumption ICC For no signal input 8.0 15.0 22.0 mA
Conversion gain CG Pin= - 40dBm, 50Ω load 15.0 18.0 23.0 dB
IF output power Pout (IF) Pin= - 10dBm, 50Ω load - 4.5 - 2.0 dBm
Third-order intermodulation distortion IM3 fRF1=866.4MHz, Pin1= - 40dBm 45 49.0 dBc
fRF2=866.8MHz, Pin2= - 40dBm
Noise figure NF DSB mode 7.5 10 dB
Standby current consumption ICC (PD) 5pin (P/S)≤1.0V 220 ∗2350 ∗2µA
Power saving control voltage Vp/s (ON) 1.8 4.5 V
Vp/s (OFF) 1.0 V
Rise time Tup 2.5 5.0 µs
∗1: fIFin=150.05MHz, fRFout=864.05 to 868.05MHz
fLoin=1014.10 to 1018.1MHz (- 9dBm)
∗2: These are the total values for the up and down converters.
∗3: fRFin=864.05 to 868.05MHz
fLoin=1014.10 to 1018.1MHz (- 9dBm)
Typical Reference characteristics
(Ta=25°C, VCC=2.7V, ZL=ZS=50Ω)
Item Symbol Conditions Typ. Unit
Up Converter Block
Third-order intermodulation distortion IM3 fIF1=150.4MHz, PIF1= - 30dBm 39.0 dBc
fIF2=150.8MHz, PIF2= - 30dBm
Down Converter Block
1 dB compression P- 1dB Output conversion, 50Ω load - 7.0 dBm
Lo leak ISO (Lo) Pin= - 40dBm - 29.0 dB
RF leak ISO (RF) Pin= - 40dBm - 44.0 dB
—4—
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