SA627 Datasheet, PDF (4/16 Pages) NXP Semiconductors – High performance low power FM IF system with high-speed RSSI

Philips Semiconductors
High performance low power mixer FM IF system
with high-speed RSSI
Product specification
SA627
AC ELECTRICAL CHARACTERISTICS
T_A = 25°C; V_CC = +6V, unless otherwise stated. RF frequency = 45MHz + 14.5dBV RF input step-up; IF frequency = 455kHz; R17 = 5.1k; RF
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
UNITS
MIN
TYP
MAX
Mixer/Osc section (ext LO = 300mV)
f_IN
f_OSC
Input signal frequency
Crystal oscillator frequency
Noise figure at 45MHz
500
MHz
150
MHz
5.0
dB
Third-order input intercept point
f1 = 45.0; f2 = 45.06MHz
-10
dBm
Conversion power gain
Matched 14.5dBV step-up
10
13
15
dB
50Ω source
-1.7
dB
RF input resistance
Single-ended input
3.0
4.7
kΩ
RF input capacitance
3.5
4.0
pF
Mixer output resistance
(Pin 20)
1.25
1.5
kΩ
IF section
IF amp gain
50Ω source
39.7
dB
Limiter gain
50Ω source
62.5
dB
Input limiting -3dB, R₁₇ = 5.1k
AM rejection
Test at Pin 18
80% AM 1kHz
-113
dBm
29
34
43
dB
Audio level, R₁₀ = 100k
SINAD sensitivity
15nF de-emphasis
RF level -118dB
80
150
260
mV_RMS
16
dB
THD
Total harmonic distortion
-34
-42
dB
S/N
Signal-to-noise ratio
IF RSSI output, R₉ = 100kΩ¹
No modulation for noise
IF level = -118dBm
IF level = -68dBm
73
dB
0
160
650
mV
1.9
2.5
3.1
V
IF level = -18dBm
4.0
4.8
5.6
V
IF frequency = 455kHz
RF level = -56dBm
1.2
µs
IF RSSI output rise time
RF level = -28dBm
1.2
µs
(10kHz pulse, no 455kHz filter)
IF frequency = 10.7MHz
(no RSSI bypass capacitor)
RF level = -56dBm
1.2
µs
RF level = -28dBm
1.1
µs
IF frequency = 455kHz
RF level = -56dBm
2.1
µs
IF RSSI output fall time
RF level = -28dBm
7.6
µs
(10kHz pulse, no 455kHz filter)
IF frequency = 10.7MHz
(no RSSI bypass capacitor)
RF level = -56dBm
2.0
µs
RF level = -28dBm
7.3
µs
RSSI range
RSSI accuracy
IF input impedance
R₉ = 100kΩ Pin 16
90
dB
R₉ = 100kΩ Pin 16
+1.5
dB
1.40
1.6
kΩ
IF output impedance
0.85
1.0
kΩ
Limiter input impedance
1.40
1.6
kΩ
Limiter output impedance
Pin 10 or 11
300
Ω
Limiter output level
Pin 10 or 11 with no load
3kΩ load (min)
280
250
mV_RMS
1997 Nov 07
4