SR3225SAA
RF Transmitter Module

SR3225SAASR3225SAA

pbfree

RoHs

automotive

  • SR3225SAA is a wireless transmitter module for UHF range.
  • Crystal resonator, oscillator, PLL and Power Amp are integrated in 3.2 mm x 2.5 mm ceramic package.
  • Application
    : Remote Keyless Entry
    : Passive Entry
    : Short range radio data transmitter
    : Garage door opener
    : Transmitter for RFID tag

Block diagram

Terminal connection External dimensions

Overview

  • Carrier frequency bands
    300 MHz to 465 MHz (0.25 kHz Step)
    600 MHz to 930 MHz (0.49 kHz Step)
  • Δ-Σ fractional-N based PLL
  • Programmable Power Amp output power:-15 to 11 dBm, 128 steps
  • Modulation types: ASK/OOK/FSK with Soft-ASK and/or Soft FSK shaping
  • 3-wire/4-wire SPI interface
  • SFR (Special Function Register)
  • Embedded 32 MHz crystal resonator and oscillation circuit
  • Programmable clock output via CKOUT
  • Programmable voltage threshold of Under Voltage Detection: 4 steps (1.8 V to 2.4 V)
  • Fail-Safe mechanism (PLL Loss of Lock, VCO auto-calibration error, Under Voltage Detection)

Specification (characteristics)

Parameter Symbol Condition Specification Unit
Min. Typ. Max.
Supply voltage VDD - 1.8 3.0 3.6 V
Operation temperature Ta - -40 - +85
Storage temperature Tstg - -40 - +125
Supply current
Powerdown Mode
IDDPD VDD = 3.0 V, Ta = +25 ℃ - 20 100 nA
Supply current
Transmitter-Active Mode
IDDTMA FTX = 315 MHz, Pout = 5 dBm, - 10.0 11.0 mA
FTX = 315 MHz, Pout = 8 dBm, - 12.7 13.7
FTX = 315 MHz, Pout = 10 dBm, - 15.0 16.0
Carrier frequency bands FTX - 300 - 465 MHz
600 - 930
ASK Bit rate RASK NRZ - - 100 kbps
FSK Bit rate RFSK NRZ - - 50 kbps
Crystal frequency tolerance FTOL Ta = +25℃, without aging -2 - 2 ppm
Crystal temperature variation FTC Ta = -40℃ to +85℃ -20 - 20 ppm
Nominal output power POUT Ta = +25℃
VDD = 3.0V
FTX = 315 MHz
HPWR =1
AM* = 0x3F
10 11 12 dBm
Ta = +25℃
VDD = 3.0V
FTX = 315 MHz
HPWR =0
AM* = 0x01
-16 -15 -14

Terminal connection / External dimensions

(Unit:mm)

Terminal connection External dimensions

Pin descriptions

Pin No. Pin Name Function
1 TEST1

Test, Transmission data input or SPI interface data output

2 EN Enable input or SPI interface chip select
3 SCK SPI interface clock input
4 SDIO

SPI data input / output or Transmission data input

5 CKOUT Clock output
6 VSSPA GND for Power Amp
7 PAOUT Power Amp output
8 RFC RF choke coil connect pin
9 VDD Positive power supply
10 VSS GND

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