SL1640 ZARLINK [Zarlink Semiconductor Inc], SL1640 Datasheet - Page 3

• Manufacturer Part Number: SL1640
• Description: THIS DOCUMENT IS FOR MAINTENANCE PURPOSES ONLY AND IS NOT RECOMMENDED FOR NEW DESIGNS
• Manufacturer: ZARLINK [Zarlink Semiconductor Inc]

SL1640
APPLICATION NOTES
which normally should be chosen to present a low reactance
compared with the input and output impedances (see
Electrical Characteristics). However, for minimum carrier leak
at high frequencies the signal input should be driven from a low
impedance source, in which case the signal input capacitor
reactance should be comparable with the source impedance.
Pin 2 must be decoupled to earth via a capacitor which
presents the lowest possible impedance at both carrier and
signal frequencies. The presence of these frequencies at Pin
2 would give rise to poor rejection figures and to distortion
source of output impedance 350 ohms and 8pF and the other
is the emitter of an emitter follower connected to the first output.
The output on pin 6 requires a discrete load resistor of not less
than 1500 ohms to ground. The emitter follower output should
not be used to drive capacitive loads as emitter followers act
as detectors under such circumstances with resultant
distortion and harmonic generation.
components may be connected to the voltage output and the
shaped signal taken from the emitter follower.
ELECTRICAL CHARACTERISTICS
Supply current
Conversion gain
Noise figure
Carrier input impedance
Signal input impedance
Maximum input voltage
Signal leak
Signal leak
Intermodulation products
The SL1640 requires input and output coupling capacitors
There are two outputs from the SL1640: one is a voltage
These characteristics are guaranteed over the following conditions (unless otherwise stated)
Characteristics
Supply voltage V
Ambient temperature: 22 C
CC
: 6V
SL1640
SL1640
SL1640
SL1640
SL1640
SL1640
SL1640
Circuit
Frequency shaping
2 C
Min.
-3
Value
Typ.
500
210
-30
-18
-45
12
10
0
1
on the carrier and signal input pins, as shown in Fig.3. With
carrier but no signal R1 is adjusted for minimum carrier leak
A similar network is connected to the carrier input and with
signal and carrier present, signal leak is minimised by means
of R2.
Signal and carrier leak may be reduced by altering the bias
Max.
+3
17
Fig.3 Signal and carrier leak adjustment
mV rms
Units
mA
K
K
dB
dB
dB
dB
dB
Signal: 70mVrms, 1.75MHz
Carrier: 100mV rms, 28.25MHz
Output: 30MHz
Signal: 70mVrms, 30MHz
Carrier: 100mV rms, 28.25MHz
Output: 1.75MHz
Signal 1: 42.5mVrms, 1.75MHz
Signal 2: 42.5mV rms, 2MHz
Carrier: 100mV rms, 28.25MHz
Output: 29.75MHz
Conditions