AD8366ACPZ-R7 datasheet(27/28 Pages) AD

27 / 28 page

AD8366

Rev. A | Page 27 of 28

Components

Function

Default Conditions

S1, S5, S7, R53, R57, R79,

C29, C30, C31

Enable interface includes device enable and data enable.

Device enable. The AD8366 is enabled by applying a logic high

voltage to the ENBL pin. The device is enabled when the S1 switch is

set in the down position (high), connecting the ENBL pin to VPSI_A.

Data enable. DENA and DENB are used to enable the data path for

Channel A and Channel B, respectively. Channel A is enabled when

the S5 switch is set in the down position (high), connecting the DENA

pin to VPSI_A. Likewise, Channel B is enabled when the S7 switch is

set in the down position (high), connecting the DENB pin to VPSI_A.

Both channels are disabled by setting the switches to the up position,

connecting the DENA and DENB pins to GND.

S1, S5, S7 = installed,

R53, R57 = 5.1 kΩ (size 0603),

R79 = 10 kΩ (size 0402),

C30 = 0.01 μF (size 0402),

C29, C31 = 1500 pF (size 0402)

S2, S3, S4, S6, S8, S9, S10

R26, R32, R40 to R43, R61,

R64, C23, C33, U1

Serial/parallel interface control. SENB is used to set the data control

either in parallel or serial mode. The parallel interface is enabled when

S4 is in the up position (low). The serial interface is enabled when S4

is in the down position (high).

For SENB pulled low, BIT0 (S9) sets 0.25 dB gain, BIT1 (S2) sets 0.5 dB

gain, BIT2 (S3) sets 1 dB gain, BIT3 (S6) sets 2 dB gain, BIT4 (S8) sets

4 dB gain, and BIT5 (S10) sets 8 dB gain.

For SENB pulled high, BIT0 becomes a chip select (CS), BIT1 becomes

a serial data input (SDAT), and BIT2 becomes serial clock (SCLK). BIT3 to

BIT5 are not used in serial mode. U1 is used to deglitch the SCLK signal.

S2, S3, S4, S6, S8, S9, S10 = installed,

R26 = 698 kΩ (size 0603),

R32, R40 to R43, R61, R64 = 5.1 kΩ

(size 0603),

C23, C33 = 1500 pF (size 0603),

U1 = SN74LVC2G14 inverter chip

S11, S12, C9, C10

DC offset correction loop compensation.

The dc offset correction loop is enabled (high) with S11 and S12 for

Channel A and Channel B, respectively, when the enabled pins, OFSA/

OFSB, are connected to ground through the C9 and C10 capacitors.

When disabled (low), OFSA/OFSB are connected to ground directly.

S11, S12 = installed,

C9, C10 = 8200 pF (size 0402)

R10, R22, R24, R28, C22,

C28

Output common-mode setpoint. The output common mode on

Channel A and Channel B can be set externally when applied to

VCMA and VCMB. The resistive change through the potentiometer

sets a variable VCMA voltage. If left open, the output common mode

defaults to VPOS/2.

R10, R24 = 10 kΩ potentiometers,

R22, R28 = 0 Ω,

C22, C28 = 0.1 μF (size 0402)

C2, C3, C11, C12

Reference output decoupling capacitor to circuit common.

C2, C3 = 0.1 μF (size 0402),

C11, C12 = 0.01 μF (size 0402)

AD8366ACPZ-R7 数据表(PDF) 27 Page - Analog Devices

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