RF2713TR7 RFMD, RF2713TR7 Datasheet - Page 5

• Manufacturer Part Number: RF2713TR7
• Description: IC QUADRATURE MOD/DEMOD 14-SOIC
• Manufacturer: RFMD

Specifications of RF2713TR7

• Function: Modulator/Demodulator
• Frequency: 100kHz ~ 250MHZ
• Package / Case: 14-SOIC (0.154", 3.90mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 689-1018-2

Rev A6 DS080403
Pin
13
14
LO INPUT
Function
VCC
Description (Demodulator Configuration)
High impedance, single-ended modulator LO input. The LO applied to this
pin is frequency divided by a factor of 2 and becomes the "Carrier". For
direct demodulation, the Carrier is equal in frequency to the center of the
input IF spectrum (except in the case of SSB/SC). The input impedance is
determined by an internal 500Ω bias resistor to V
capacitor should be provided if the pin is connected to a device with DC
present. Matching the input impedance is typically achieved by adding a
51Ω resistor to ground on the source side of the AC coupling capacitor. For
the LO input, maximum power transfer is not critical. The internal LO
switching circuits are controlled by the voltage, not power, into the part. In
cases where the LO source does not have enough available voltage, a reac-
tive match (voltage transformer) can be used. The LO circuitry consists of a
limiting amplifier followed by a digital divider. The limiting amp ensures
that the flip-flop type divider is driven with a square wave over a wide range
of input levels. Because the flip-flop uses the rising and falling edges of the
limiter output, the quadrature accuracy of the Carrier supplied to the mix-
ers is directly related to the duty cycle, or equivalently to the even harmonic
content, of the input LO signal. In particular, care should be taken to
ensure that the 2xLO level input to this pin is at least 20dB below the LO
level. Otherwise, the LO input is not sensitive to the type of input wave
form, except for IF frequencies below ~2.5MHz, in which case the LO input
should be a square wave, in order to ensure proper triggering of the flip-
flops. IF frequencies below 100kHz are attainable if the LO is a square
wave and sufficiently large DC blocking capacitors are used.
Voltage supply for the entire device. This pin should be well bypassed at all
frequencies (IF, LO, Carrier, Baseband) that are present in the part.
7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at ([phone] or [e-mail].
CC
. An external blocking
Interface Schematic
LO IN
RF2713
V
CC
500 Ω
V
CC
500 Ω
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