SA626 Datasheet, PDF (2/16 Pages) NXP Semiconductors – Low voltage high performance mixer FM IF system with high-speed RSSI

Philips Semiconductors
Low voltage high performance mixer FM IF
system with high-speed RSSI
Product specification
SA626
DESCRIPTION
The SA626 is a low-voltage high performance monolithic FM IF
system incorporating a mixer/oscillator, two limiting intermediate
frequency amplifiers, quadrature detector, high speed logarithmic
received signal strength indicator (RSSI), voltage regulator and
audio and fast RSSI op amps. The SA626 is available in 20-lead
SOL (surface-mounted small outline large package) and 20-lead
SSOP (shrink small outline package).
The SA626 was designed for high bandwidth portable
communication applications and will function down to 2.7V. The RF
section is similar to the famous NE605. The audio and RSSI
outputs have amplifiers. The RSSI output has access to the
feedback pin. This enables the designer to level adjust the outputs
or add filtering.
SA626 incorporates a power down mode which powers down the
device when Pin 8 is low. Power down logic levels are CMOS and
TTL compatible with high input impedance.
APPLICATIONS
• Digital cordless telephones
• Digital cellular telephones
• Digital cellular base stations
• Portable high performance communications receivers
• Single conversion VHF/UHF receivers
• SCA receivers
• RF level meter
• Spectrum analyzer
• Instrumentation
• FSK and ASK data receivers
• Log amps
• Wideband low current amplification
FEATURES
• Fast RSSI rise and fall times
• Low power consumption: 6.5mA typ at 3V
• Power down mode (I_CC = 200µA)
PIN CONFIGURATION
D and DK Packages
RF_IN 1
RF BYPASS 2
20 MIXER OUT
19 IF AMP DECOUPLING
XTAL OSC EMITTER 3
XTAL OSC (BASE) 4
18 IF AMP IN
17 IF AMP DECOUPLING
V_CC 5
RSSI FEEDBACK 6
16 IF AMP OUT
15 GND
RSSI_OUT 7
POWER DOWN CONTROL 8
14 LIMITER IN
13 LIMITER DECOUPLING
AUDIO OUT ⁹
QUADRATURE IN 10
12 _{LIMITER DECOUPLING}
11 LIMITER OUT
SR00470
Figure 1. Pin Configuration
• Mixer input to >500MHz
• Mixer conversion power gain of 11dB at 240MHz
• Mixer noise figure of 14dB at 240MHz
• XTAL oscillator effective to 150MHz (L.C. oscillator to 1GHz, local
oscillator can be injected)
• 92dB of IF Amp/Limiter power gain
• 25MHz limiter small signal bandwidth
• Temperature compensated logarithmic Received Signal Strength
Indicator (RSSI) with a dynamic range in excess of 90dB
• Audio output internal buffer
• RSSI output internal buffer
• Internal op amps with rail-to-rail outputs
• 10.7MHz filter matching (330Ω) reduces external component
count; suitable for crystal/ceramic/LC filters
• Excellent sensitivity: 0.54µV into 50Ω matching network for 12dB
SINAD (Signal to Noise and Distortion ratio) for 1kHz tone with RF
at 240MHz and IF at 10.7MHz
• SA626 meets cellular radio specifications
• ESD hardened
ORDERING INFORMATION
DESCRIPTION
20-Pin Plastic Small Outline Large (SOL) package (Surface-mount)
20-Pin Plastic Shrink Small Outline Package (Surface-mount)
TEMPERATURE RANGE
-40 to +85°C
-40 to +85°C
ORDER CODE
SA626D
SA626DK
DWG #
SOT163-1
SOT266-1
1997 Sept 25
2
853-1723 18427