ADMV1455BBCZ-R7 datasheet(77/141 Pages) AD

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Data Sheet

ADMV1455

THEORY OF OPERATION

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DSA2

The DSA directly after the LNA in the RF signal chains is DSA2.

This attenuator offers two states, 0dB and 6dB. When using the

bypass registers (Register 0x28A set to 1), use Register 0x28B,

Bit 4, to set the DSA2 state. When not using the bypass registers

(Register 0x28A set to 0), use Register 0x600, Bit 4, to set the

DSA2 state. Set Bit 4 to 0 for the 0dB state and 1 for the 6dB state.

DSA3

The DSA directly after DSA2 in the RF signal chains is DSA3.

This attenuator offers 16 states, 0dB to 15dB, with steps of 1dB.

The attenuation is proportional to the value programmed. When

using the bypass registers (Register 0x28A set to 1), use Register

0x28C, Bits[3:0] to set the DSA3 state. When not using the bypass

registers (Register 0x28A set to 0), use Register 0x601, Bits[3:0] to

set the DSA3 state.

RF TUNABLE LPFS

Both the low band and the high band RF signal chains contain a

tunable LPF to help reject image frequencies. Each tunable LPF

contains 4 bits, or 16 states, that control the cutoff frequency.

The cutoff frequency is inversely proportional to the LPF value

programmed.

When using the bypass register (Register 0x2A0), set Bit 4 to 1,

and then program the intended LPF value into Bits[3:0]. When not

using the bypass register (Register 0x2A0), set Bit 4 to 0, then use

When using either Register 0x802 or the frequency LUT, the low

band tunable LPF has three control bits (0 to 7), and the value

programmed is multiplied by 2 (shift left by one position). For

example, when Register 0x802, Bits[7:4] are set to 7, the effective

LPF value is 14.

When using either Register 0x802 or the frequency LUT, the high

band tunable LPF retains the full 4 control bits.

RF TUNABLE HPF

The high band RF signal chains contain a tunable HPF to help

reject image frequencies. The tunable HPF contains 6 bits, or 64

states, that control the cutoff frequency. The cutoff frequency is

inversely proportional to the HPF value programmed.

When using the bypass register (Register 0x2A1), set Bit 7 to 1,

and then program the intended HPF value into Bits[5:0]. When not

using the bypass register (Register 0x2A1), set Bit 7 to 0, then use

When using either Register 0x804 or the frequency LUT, the

tunable HPF has four control bits, and the value programmed is

multiplied by 4 (shift left by two positions). For example, when

60.

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