CC2591

SWRS070B – MARCH 2008 – REVISED SEPTEMBER 2014

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Table 5-1. List of Materials (See CC2591EM Reference Design)

DEVICE

FUNCTION

VALUE

L112

Part of antenna match.

1.5 nH: LQW15AN1N5B00 from Murata

L111

DC block.

1 nF: GRM1555C1H102JA01 from Murata

C111

Part of antenna match.

1 pF: GRM1555C1H1R0BZ01 from Murata

C161

Decoupling capacitor.

1 nF: GRM1555C1H102JA01 from Murata

10 pF || 1 nF. The smallest cap closest. See CC2591EM

reference design (SWRU190) for placement.

C11/C12

Decoupling. Will affect PA resonance.

10 pF: GRM1555C1H100JZ01 from Murata

1 nF: GRM1555C1H102JA01 from Murata

18 pF || 1 nF. The smallest cap closest. See CC2591EM

reference design (SWRU190) for placement.

C101/C102

Decoupling. Will affect PA resonance.

18 pF: GRM1555C1H180JZ01 from Murata

1 nF: GRM1555C1H102JA01 from Murata

10 pF || 1 nF. The smallest cap closest. See CC2591EM

reference design (SWRU190) for placement.

C131/C132

Decoupling. Will affect PA resonance.

10 pF: GRM1555C1H100JZ01 from Murata

1 nF: GRM1555C1H102JA01 from Murata

C2

Decoupling of external balun

1 nF: GRM1555C1H102JA01 from Murata

TL11

Transmission line. Will affect PA resonance.

See CC2591EM reference design.

TL101

Transmission line. Will affect PA resonance.

See CC2591EM reference design.

TL131

Transmission line. Will affect LNA resonance.

See CC2591EM reference design.

R151

Bias resistor

4.3 k

Ω: RK73H1ETTP4301F from Koa

5.2

Controlling the Output Power from CC2591

The output power of CC2591 is controlled by controlling the input power. The CC2591 PA is designed to

work in compression (class AB), and the best efficiency is reached when a strong input signal is applied.

5.2.1

Input Levels on Control Pins

The four digital control pins (PAEN, EN, HGM, RXTX) have built-in level-shifting functionality, meaning

that if the CC2591 is operating from a 3.6-V supply voltage, the control pins will still sense 1.6-V - 1.8-V

signals as logical ‘1’.

An example of the above would be that RXTX is connected directly to the RXTX pin on CC24xx, but the

global supply voltage is 3.6 V. The RXTX pin on CC24xx will switch between 0 V (RX) and 1.8 V(TX),

which is still a high enough voltage to control the mode of CC2591.

The input voltages should however not have logical ‘1’ level that is higher than the supply.

5.2.2

Connecting CC2591 to a CC24xx Device

Table 5-2. Control Logic for Connecting CC2591 to a CC24xx Device

PAEN = EN

RXTX

HGM

MODE OF OPERATION

0

X

X

Power Down

1

0

0

RX Low Gain Mode

1

0

1

RX High Gain Mode

1

1

X

TX

10

Applications, Implementation, and Layout

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