SX1223 데이터 시트보기 (PDF) - Semtech Corporation

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SX1223

425 – 475 MHz / 850 – 950 MHz Integrated UHF Transmitter

Semtech Corporation 

SX1223

Add Bit

16 3

VCO_by

0

1

State

VCO is active (default)

VCO is bypassed

Comment

When VCO is bypassed, a differential signal can be

applied to the circuit using pin CPOUT and VARIN

Table 30: VCO bypass bit

Add Bits PA_IB3 PA_IB2 State

17 7-6

0

0

PA uses bias current from PTAT bias source, external resistor (Pin 6)

0

1

PA uses bias current from CI bias source, external resistor (Pin 24)

1

0

PA uses bias current from internal bias source, PTAT

1

1

PA uses bias current from internal bias source, PTAT + CI (default)

Add Bits PA_IB1 PA_IB0 State

17 5-4

0

0

PA bias current setting, lowest bias current

0

1

PA bias current setting (default)

1

0

PA bias current setting

1

1

PA bias current setting, highest bias current

Add Bits PAB_IB3 PAB_IB2 State

17 3-2

0

0

PAbuffer uses bias current from PTAT bias source, external resistor (Pin 6)

0

1

PAbuffer uses bias current from CI bias source, external resistor (Pin 24)

1

0

PAbuffer uses bias current from internal bias source, PTAT

1

1

PAbuffer uses bias current from internal bias source, PTAT + CI (default)

Add Bits PAB_IB1 PAB_IB0 State

17 1-0

0

0

PAbuffer bias current setting, lowest bias current

0

1

PAbuffer bias current setting (default)

1

0

PAbuffer bias current setting

1

1

PAbuffer bias current setting, highest bias current

Table 31: PA and PAbuffer bias current setting

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