MC13110A datasheet(22/68 Pages) MOTOROLA

Part #	MC13110A

Description	UNIVERSAL CORDLESS TELEPHONE SUBSYSTEM IC

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Manufacturer	MOTOROLA [Motorola, Inc]

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22 / 68 page

MC13110A/B MC13111A/B

22

MOTOROLA ANALOG IC DEVICE DATA

Second Mixer

Figures 26 through 29 represents the second mixer

transfer characteristics for the voltage conversion gain,

output level, and intermodulation. There is a slight

improvement in gain when the “IP3 bit” is set to <1> for the

second mixer. (Note: This is the same programmable bit

discussed earlier in the section.)

Figure 23. Second Mixer Input and Output

Impedance Schematic

2nd Mixer

Mix2 In

Mix2 Out

RPI

CPI

RPO

CPO

Figure 24. Second Mixer Input and Output

Impedances

Unit

Input Impedance

RPI // CPI

Output

Impedance

RPO // CPO

IP3 = <0> (Set Low)

2817

Ω // 3.6 pF

1493

Ω // 6.1 pF

IP3 = <1> (Set High)

2817

Ω // 3.6 pF

1435

Ω // 6.2 pF

The 2nd mixer input impedance is typically 2.8 k

Ω. It

requires an external 360

Ω parallel resistor for use with a

standard 330

Ω, 10.7 MHz ceramic filter. The second mixer

output impedance is 1.5 k

Ω making it suitable to match

standard 455 kHz ceramic filters.

The IF bandwidth response of the second mixer is shown

in Figure 31. The –3.0 dB corner is 2.5 MHz. The feedthrough

parameters are summarized in Figure 25.

Figure 25. Second Mixer Feedthrough Parameters

Parameter

(dBm)

2nd LO Feedthrough @ Mix2 Out

–42.9

IF Feedthrough @ Mix2 Out with –30 dBm

–61.7

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MC13110A Datasheet(PDF) 22 Page - Motorola, Inc

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