CXA1851

CXA1851N Up/Down Converter for 900 MHz-Band Mobile Communications For the availability of this product, please contact the sales office. 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. 20 pin SSOP (Plastic) 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 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 copperfoiled glass epoxy board Applications • CT2 digital cordless telephone • Digital cellular Structure Bipolar silicon monolithic IC Recommended Operating Conditions Supply voltage Vcc 2.7 to 4.5 V Block Diagram and Pin Configuration LO IN (D) LO IN (U) MIX OUT2 11 10 IF OUT LO b (D) Vcc (D) LO b (U) 20 19 18 17 16 15 14 13 IF b MIX 12 OSC BUFFER AMP IF AMP MIX RF AMP 1 GND 2 RF b 3 RF IN 4 PEAKING OUT 5 P/S (D) 6 P/S (U) 7 Vcc (U) 8 RF OUT RF PRE AMP REG REG LNA GND IF IN 9 GND 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. —1— MIX OUT1 E93505-TE CXA1851N Pin Description Pin No. 1 2 3 Typical pin voltage (V) GND 0.0 RF BYPASS 1.1 Symbol RF INPUT 0.9 REG Equivalent circuit Description GND pin for the down converter. MIX input by-pass pin for the down converter. RF input pin for the down converter. Because of high impedance, a 4.7 nH external chip inductor should be used for impedance matching. Emitter pin for the low-noise amplifier. Connect an approximately 3 pF chip capacitor and an approximately 22Ω chip resistor in series to the GND. Power saving control pin for the down converter. OFF when Vp/s≤1.0 V; ON when Vp/s≥1.8 V Power saving control pin for the up converter. OFF when Vp/s≤1.0 V; ON when Vp/s≥1.8 V Power supply for the up converter. 2 4 PEAKING OUT 0.12 3 4 REG 5 P/S (for DOWN CONV.) 0 to 4.5 5 6 P/S (for UP CONV.) 0 to 4.5 6 7 VCC (for Up CONV.) RF OUTPUT 2.7 to 4.5 REG 8 8 2.7 (Vcc=2.7V) RF output pin for the up converter. Connect this pin to the Pin 7 power supply via the 15 nH chip inductor. GND pin for the up converter RF amplifier. 9 GND 0.0 —2— CXA1851N Pin No. 10 11 Symbol MIX OUT1 MIX OUT2 Typical pin voltage (V) 2.3 2.3 Equivalent circuit 10 11 Description MIX output pin for the up converter. 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. GND pin for the oscillator buffer amplifier and mixer blocks of the up converter. IF input by-pass pin for the up converter. IF input pin for the up converter. Because of high impedance, an external matching circuit is necessary which consists of a 220 nH chip inductor and an approximately 1.5 pF chip capacitor. Oscillator input pin for the up converter. A matching circuit consisting of a 51 Ω resistor is necessary. Oscillator input by-pass pin for the up converter. 12 GND 0.0 13 14 IF BYPASS IF INPUT 1.03 1.03 14 13 REG 15 OSC INPUT (for UP CONV.) OSC BYPASS (for UP CONV.) OSC BYPASS (for DOWN CONV.) OSC BYPASS (for DOWN CONV.) Vcc (for DOWN CONV.) IF OUTPUT 1.8 16 1.8 15 16 17 17 1.85 18 Oscillator input by-pass pin for the down converter. 18 1.85 19 2.7 to 4.5 Oscillator input pin for the down converter. A matching circuit consisting of a 51 Ω resistor is necessary. Power supply for the down converter. 20 20 1.45 IF output pin for the down converter. —3— CXA1851N Electrical Characteristics (Ta=25°C, VCC=2.7V, ZL=ZS=50Ω) Item Up Converter Block ∗1 Current consumption Conversion gain RF output power Noise figure Lo leak IF leak Standby current consumption Power saving control voltage Rise time Down Converter Block ∗3 Current consumption Conversion gain IF output power Third-order intermodulation distortion Noise figure Standby current consumption Power saving control voltage Rise time Symbol ICC CG Pout NF ISO (Lo) ISO (IF) ICC (PD) Vp/s (ON) Vp/s (OFF) Tup ICC CG Pout (IF) IM3 Conditions For no signal input Pin= - 40dBm Pin= -10dBm, 50Ω load DSB mode Pin= - 10dBm Pin= - 10dBm 6pin (P/S)