5

35

Mod_RXQ+

Quadrature demodulator positive output. AC coupling is required. Normally connects to the non inverting input of

the Low pass filter (LPF_RXQ+), pin 28.

36

Mod_RXQ-

Quadrature demodulator negative output. AC coupling is required. Normally connects to the inverting input of the

Low pass filter (LPF_RXQ+), pin 27.

37

Mod_TXI+

In phase modulator non inverting input. AC coupling is required. This input is normally coupled to the Low pass

filter positive output (LPF_TXI+), pin 26.

38

Mod_TXI-

In phase modulator inverting input. AC coupling is required. This input is normally coupled to the Low pass filter

negative output (LPF_TXI-), pin 25.

39

Mod_TXQ+

Quadrature modulator non inverting input. AC coupling is required. This input is normally coupled to the Low pass

filter positive output (LPF_TXQ+), pin 24.

40

Mod_TXQ-

Quadrature modulator inverting input. AC coupling is required. This input is normally coupled to the Low pass filter

negative output (LPF_TXQ-), pin 23.

41

Mod_TX_PE

Digital input control to enable the Modulator section. Enable logic level is High for transmit.

42

Mod_TX_IF_Out

43

Mod_RX_PE

Digital input control to enable the demodulator section. Enable logic level is High for receive.

44

Mod_LO_In

(2XLO)

Single ended local oscillator current input. Frequency of input signal must be twice the required modulator carrier

and demodulator LO frequency. Input current is optimum at 200

be designed for a wide range of power and impedances at this port. Typical input impedance is 130

Ω. This pin

requires AC coupling. (Note 3)

NOTE: High second harmonic content input waveforms may degrade I/Q phase accuracy.

45

Modulator/Demodulator supply pin. Use high quality decoupling capacitors right at the pin.

46

Mod_LO_Out

Divide by 2 buffered output reference from “Mod_LO_in” input. Used for external applications where the modulating

and demodulating carrier reference frequency is required. 50

Ω single end driving capability.This output can be

47

Modulator/Demodulator supply pin. Use high quality decoupling capacitors right at the pin.

48

Mod_IF_In+

Demodulator non inverting input. Requires AC coupling.

49

Mod_IF In-

Demodulator inverting input. Requires AC coupling.

50

LO_GND

When grounded, this pin enables the LO buffer (Mod_LO_Out). When open (NC) it disables the LO buffer.

51, 52,

53

GND

Ground. Connect to a solid ground plane.

54

LIM2_PE

Digital input control to enable the limiter amplifier 2. Enable logic level is High.

55

Limiter amplifier 2 supply pin. Use high quality decoupling capacitors right at the pin.

56

LIM2_Out-

Positive output of limiter amplifier 2. Requires AC coupling.

57

LIM2_Out+

Negative output of limiter amplifier 2. Requires AC coupling.

58

GND

Ground. Connect to a solid ground plane.

59

RSSI_RL2

Load resistor to ground. Nominal value is 6k

Ω. This load is used to terminate the LIM RSSI current output and

maintain temperature and process variation to a minimum.

60

LIM2_RSSI

Current output of RSSI for the limiter amplifier 2. Connect in parallel with the RSSI output of the amplifier limiter 1

for cascaded response.

61

LIM2_BYP+

DC feedback pin for Limiter amplifier 2. Requires good decoupling and minimum wire length to a solid signal

ground.

62

LIM2_In+

Non inverting analog input of Limiter amplifier 2.

63

LIM2_In-

Inverting input of Limiter amplifier 2.

64

LIM2_BYP-

DC feedback pin for Limiter amplifier 2. Requires good decoupling and minimum wire length to a solid signal

ground.

PIN

SYMBOL

DESCRIPTION

HFA3726