Philips Semiconductors
Product specification
High performance low power mixer FM IF system
with high-speed RSSI
SA627
AC ELECTRICAL CHARACTERISTICS
T = 25°C; V = +6V, unless otherwise stated. RF frequency = 45MHz + 14.5dBV RF input step-up; IF frequency = 455kHz; R17 = 5.1k; RF
A
CC
level = -45dBm; FM modulation = 1kHz with ±8kHz peak deviation. Audio output with C-message weighted filter and de-emphasis capacitor.
Test circuit Figure 3. The parameters listed below are tested using automatic test equipment to assure consistent electrical characterristics.
The limits do not represent the ultimate performance limits of the device. Use of an optimized RF layout will improve many of the listed
parameters.
LIMITS
SYMBOL
PARAMETER
TEST CONDITIONS
SA627
TYP
UNITS
MIN
MAX
Mixer/Osc section (ext LO = 300mV)
f
Input signal frequency
500
150
5.0
-10
13
MHz
MHz
dB
IN
f
Crystal oscillator frequency
Noise figure at 45MHz
OSC
Third-order input intercept point
Conversion power gain
f1 = 45.0; f2 = 45.06MHz
Matched 14.5dBV step-up
50Ω source
dBm
dB
10
3.0
15
-1.7
4.7
3.5
1.5
dB
RF input resistance
RF input capacitance
Mixer output resistance
Single-ended input
kΩ
4.0
pF
(Pin 20)
1.25
kΩ
IF section
IF amp gain
Limiter gain
50Ω source
39.7
62.5
-113
34
dB
dB
50Ω source
Input limiting -3dB, R = 5.1k
Test at Pin 18
80% AM 1kHz
15nF de-emphasis
RF level -118dB
dBm
dB
17
AM rejection
29
80
43
Audio level, R = 100k
150
16
260
mV
RMS
10
SINAD sensitivity
dB
THD
S/N
Total harmonic distortion
Signal-to-noise ratio
-34
-42
73
dB
dB
mV
V
No modulation for noise
IF level = -118dBm
IF level = -68dBm
1
IF RSSI output, R = 100kΩ
0
160
2.5
4.8
650
3.1
5.6
9
1.9
4.0
IF level = -18dBm
V
IF frequency = 455kHz
RF level = -56dBm
RF level = -28dBm
IF frequency = 10.7MHz
RF level = -56dBm
RF level = -28dBm
IF frequency = 455kHz
RF level = -56dBm
RF level = -28dBm
IF frequency = 10.7MHz
RF level = -56dBm
RF level = -28dBm
1.2
1.2
µs
µs
IF RSSI output rise time
(10kHz pulse, no 455kHz filter)
(no RSSI bypass capacitor)
1.2
1.1
µs
µs
2.1
7.6
µs
µs
IF RSSI output fall time
(10kHz pulse, no 455kHz filter)
(no RSSI bypass capacitor)
2.0
7.3
90
µs
µs
dB
dB
kΩ
kΩ
kΩ
Ω
RSSI range
R = 100kΩ Pin 16
9
RSSI accuracy
R = 100kΩ Pin 16
9
+1.5
1.6
1.0
1.6
300
IF input impedance
IF output impedance
Limiter input impedance
Limiter output impedance
1.40
0.85
1.40
Pin 10 or 11
Pin 10 or 11 with no load
280
250
Limiter output level
mV
RMS
3kΩ load (min)
4
1997 Nov 07