SA58641 Datasheet, PDF (2/17 Pages) NXP Semiconductors – High performance mixer FM IF system with high-speed RSSI

Philips Semiconductors
High performance mixer FM IF system
with high-speed RSSI
Objective data
SA58641
DESCRIPTION
The SA58641 is a high performance monolithic FM IF system with
high-speed RSSI incorporating a mixer/oscillator, two limiting
intermediate frequency amplifiers, quadrature detector, logarithmic
received signal strength indicator (RSSI), voltage regulator,
wideband data output and fast RSSI op amps. The SA58641 is
available in 20-lead SSOP (shrink small outline package).
The SA58641 was designed for high bandwidth portable
communication applications and will function down to 2.7 V. The RF
section is similar to the famous SA605. The data output has a
minimum bandwidth of 600 kHz. This is designed to demodulate
wideband data. The RSSI output is amplified. The RSSI output has
access to the feedback pin. This enables the designer to adjust the
level of the outputs or add filtering.
SA58641 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.
FEATURES
• Wideband data output (600 kHz min.)
• Fast RSSI rise and fall times
• Low power consumption: 7.5 mA typ. at 5 V
• Mixer input to >500 MHz
• Mixer noise figure of 12 dB at 240 MHz
• XTAL oscillator effective to 150 MHz (L.C. oscillator to 1 GHz local
oscillator can be injected)
• 92 dB of IF Amp/Limiter gain
• 25 MHz limiter small signal bandwidth
• Temperature compensated logarithmic Received Signal Strength
Indicator (RSSI) with a dynamic range in excess of 90 dB
• RSSI output internal op amp
• Internal op amps with rail-to-rail outputs
• Low external component count; suitable for crystal/ceramic/LC
filters
• Excellent sensitivity: 0.54 µV into 50 Ω matching network for
12 dB SINAD (Signal to Noise and Distortion ratio) for 1 kHz tone
with RF at 240 MHz and IF at 10.7 MHz
• ESD hardened
• 10.7 MHz filter matching (330 Ω)
• Power-down mode (I_CC = 200 µA)
ORDERING INFORMATION
DESCRIPTION
20-Pin Plastic Shrink Small Outline Package (Surface-mount)
PIN CONFIGURATION
DK Package
RF_IN
1
RF BYPASS 2
XTAL OSC (EMITTER) ³
XTAL OSC (BASE) ⁴
V_CC 5
RSSI FEEDBACK 6
RSSI_OUT 7
POWER DOWN CONTROL 8
DATA OUT ⁹
QUADRATURE IN 10
20 MIXER OUT
19 IF AMP DECOUPLING
18 IF AMP IN
17 IF AMP DECOUPLING
16 IF AMP OUT
15 ^GND
14 LIMITER IN
13 LIMITER DECOUPLING
12 _{LIMITER DECOUPLING}
11 LIMITER OUT
Figure 1. Pin configuration
SR00491
APPLICATIONS
• DECT (Digital European Cordless Telephone)
• Digital cordless telephones
• Digital cellular telephones
• Portable high performance communications receivers
• Single conversion VHF/UHF receivers
• FSK and ASK data receivers
• Wireless LANs
TEMPERATURE RANGE
–40 °C to +85 °C
ORDER CODE
SA58641DK
DWG #
SOT266–1
2004 Dec 16
2