AD9546SLASHPCBZ datasheet(167/205 Pages) AD

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Data Sheet

AD9546

Rev. 0 | Page 167 of 205

TEMPERATURE SENSOR

THRESHOLD

DETECTOR

TO SYSTEM CLOCK

COMPENSATION

TO DPLL0 DELAY

COMPENSATION

TO DPLL1 DELAY

COMPENSATION

IRQ MAP

TEMPERATURE

SENSOR

NOTES

1. A RANGE OF BITS USES A COLON SEPARATOR

REG 0x2902, BIT 2

REG 0x2902, BIT 1

REG 0x2902, BIT 0

REG 0x2901 TO 0x2900, BITS[15:0]

REG 0x2904 TO 0x2903, BITS[15:0]

REG 0x3004 TO 0x3003, BITS[15:0]

REG 0x2906 TO 0x2905, BITS[15:0]

REG 0x300C, BIT 4

REG 0x3002, BIT 0

Figure 112. Temperature Sensor Block Diagram

TEMPERATURE SENSOR OVERVIEW

Figure 112 shows a block diagram of the temperature sensor

and supporting circuitry. Three AD9546 functional blocks have

the capability of using temperature values.



System clock compensation



DPLL0 delay compensation



DPLL1 delay compensation

Each of these functional blocks can receive temperature values

from two sources.



The internal temperature sensor (default)



Bits[15:0] of Register 0x2900 to Register 0x2901

TEMPERATURE SOURCE SELECTION

The user selects the desired temperature source for each of the

temperature compensation functional blocks via Bits[2:0] of

source to the system clock compensation block (see the

Compensation Method 1 section). Bit 1 and Bit 2 control the

routing of the temperature source to the delay compensation

block of DPLL0 and DPLL1, respectively, (see the Delay

Compensation section). For Bits[2:0], Logic 0 (default) selects

the internal temperature sensor, whereas Logic 1 selects the

external temperature source (see the External Temperature

Source section).

INTERNAL TEMPERATURE SENSOR

The AD9546 has an internal temperature sensor with a digital

output (see Figure 112). The sensor reflects the temperature of

the silicon die, which the user can read via Bits[15:0] of Register

0x3003 to Register 0x3004. The temperature sensor indicates

temperature as a 16-bit signed (twos complement) number

scaled by 2−7, as shown in Figure 113. This format provides a

range of ±256°C with 0.0078°C resolution.

...

2–7

INTEGER PART

FRACTIONAL

PART

DECIMAL

POINT

16-BIT TEMPERATURE

Figure 113. Temperature Format

The sensor samples at approximately 25 MHz and performs a

212-sample average, providing updates at a rate of

approximately 6.1 kHz. The intent of the temperature sensor is

for tracking temperature variation rather than providing a

measure of absolute temperature.

Given internal temperature = 0x118D (4493 decimal), find the

corresponding temperature, T.

T = 4493 × 2−7°C

= 35.1015625°C

Given internal temperature = 0xF833 (−1997 decimal),

T = −1997 × 2−7°C

= −15.6015625°C

AD9546/PCBZ Datasheet(PDF) 167 Page - Analog Devices

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