RF2713 查看數據表（PDF） - RF Micro Devices

零件编号

产品描述 (功能)

生产厂家

RF2713

QUADRATURE MODULATOR/DEMODULATOR

RF Micro Devices 

RF2713

Pin Function Description (Modulator Configuration)

Interface Schematic

7

Q IF OUT Same as pin 6, except complementary input.

Same as pin 6.

8

Q OUT

Pins 8 and 9 are not used in a normal quadrature modulator application,

and are left unconnected. Note, however, that the outputs of each of these

pins are independent upconverted I and Q channels. These signals may be

useful in other applications where independent IF channels are needed.

Also note that these outputs are optimized as baseband outputs for the

demodulator configuration. As a result, the gain rolls-off quickly with

increasing frequency. This gain roll-off will limit the usefulness of these

pins as independent I and Q upconverters. If these outputs are to be used,

please refer to the Demodulator pin descriptions regarding load imped-

ances.

VCC

I/Q OUT

2 kΩ

9

I OUT

Same as pin 8, except Q Mixer’s Output.

Same as pin 8.

10

GND

Ground connection. Keep traces physically short and connect immediately

to ground plane for best performance.

11

GND

Same as pin 10.

12

GND

Same as pin 10.

13

LO INPUT 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

VCC

VCC

modulation, the Carrier is the center of the modulated output spectrum

(except in the case of SSB/SC). The input impedance is determined by an

500 Ω

500 Ω

internal 500Ω bias resistor to VCC. An external blocking capacitor should

LO IN

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 reactive match (volt-

age transformer) can be used. The LO circuitry consists of a limiting ampli-

fier 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 mixers 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 fre-

quencies 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.

14

VCC

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.

Rev A5 DS061016

7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical

support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.

7 of 16

Share Link: