ADC3541 datasheet(39/68 Pages) TI1

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7.3.5.5.1 Configuration Example

The following is a step by step programming example to configure the ADC354x to complex decimation by 8 with

1-wire serial CMOS and 16-bit output.

1. 0x07 (address) 0x6C (load bit mapper configuration for 16-bit output with 1-wire serial CMOS)

2. 0x13 0x01, wait 1 ms, 0x13 0x00 (load e-fuse)

3. 0x0A 0xFF, 0x0B 0xFF, 0x0C 0xFD (power down unused CMOS output buffers to avoid contention)

4. 0x18 0x10 (DCLKIN EN for serial CMOS mode)

5. 0x19 0x82 (configure FCLK)

6. 0x1B 0x0A (select 16-bit output resolution)

7. 0x1F 0x50 (DCLKIN EN for serial CMOS mode)

8. 0x20 0xFF, 0x21 0xFF, 0x22 0x0F (configure FCLK pattern)

9. 0x24 0x06 (enable decimation filter)

10.0x25 0x30 (configure complex decimation by 8)

11.0x2A/B/C/D and 0x31/32/33/34 (program NCO frequency)

12.0x27/0x2E 0x08 (configure Q-delay register bit)

13.0x26 0xAA, 0x26 0x88 (set digital mixer gain to 6-dB and toggle the mixer update)

7.3.6 Test Pattern

In order to enable in-circuit testing of the digital interface, the following test patterns are supported and enabled

via SPI register writes (0x14/0x15/0x16). In decimation mode (real and complex), the test patterns replace the

output data of the DDC - however channel A controls the test patterns for both channels.

• RAMP Pattern: The step size is set in the CUSTOM PAT register according to the native ADC resolution.

• Custom, constant Pattern

7.3.7 Temperature Sensor

The ADC354x includes an on-chip temperature sensor with a typical accuracy of ± 2°C. The die temperature can

be measured and the temperature read out via SPI using the following programming steps (address/data):

1. 0x10 0x04 (enable temperature conversion)

2. 0x08 0x08 (enable temperature sensor)

3. 0x0F 0x03 (configure temperature sensor clock speed)

4. Read back 9-bit temperature value from 0x05 (D0) and 0x06 (D7-D0)

The die temperature is interpreted the following way:

The 9-bit read out value corresponds to the on-chip temperature in °C as illustrated in Table 7-11. The MSB

contains the sign bit (+ or -) while the 8 LSBs contain the temperature value. For example 0x019 corresponds to

+ 25°C and 0x119 to - 25°C.

Table 7-11. Die temperature register value

DIE TEMP [8:0]

[8]

[7]

[6]

[5]

[4]

[3]

[2]

[1]

[0]

Sign

8-bit die temperature value

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ADC3541

SBAS840 – JULY 2020

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