Data acquisition & sampling worksheet with answers

Free printable Data acquisition & sampling worksheet: 6 problems from easy to exam level, with an answer key. Print it or save it as a PDF.

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1.Easy

A UART link runs at 4800 baud. Find the duration T_b of one bit, in µs.

baud = 4800 Bd

T_b = µs

2.Easy

A 10-bit ADC has an input range of 0 to 10 V. Taking 1 LSB = V_FSR/2ᴺ, find the size of one LSB in mV.

N = 10V_FSR = 10 V

1 LSB = mV

3.Medium

Find the ideal signal-to-quantisation-noise ratio SQNR of a 16-bit ADC for a full-scale sine wave.

N = 16

SQNR = dB

4.Medium

A UART sends bytes at 115200 baud in the format 8E1: 8 data bits, an even parity bit and 1 stop bit(s), plus the start bit. Find the largest number of data bytes per second it can transfer.

baud = 115200 Bd8E1

R_B = B/s

5.Hard

A temperature sensor gives 10 mV/°C (0 V at 0 °C). Its signal is amplified 2 times and fed to an 8-bit ADC with a range of 0 to 2.5 V (1 LSB = V_FSR/2ᴺ). Find the temperature change ΔT_LSB that corresponds to one LSB.

S = 10 mV/°CG = 2N = 8V_FSR = 2.5 V

ΔT_LSB = °C

6.Hard

A microcontroller with a 2 MHz clock sets its UART baud rate as f_clk/(16·D), with D a whole number rounded to the nearest value. The target is 57600 baud. Find the percentage error of the real baud rate (positive when it is too fast).

f_clk = 2 MHztarget = 57600 Bd

e = %

Answer key

1. T_b = 208.3 µs
2. 1 LSB = 9.766 mV
3. SQNR = 98.08 dB
4. R_B = 10473 B/s
5. ΔT_LSB = 0.4883 °C
6. e = 8.507 %

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