STM32U595AI datasheet(286/377 Pages) STMICROELECTRONICS

286 / 377 page

Electrical characteristics

STM32U59xxx

286/377

DS13633 Rev 1

5.3.24

Voltage reference buffer characteristics

SNR

Signal-to-noise

ratio(6)

DAC output buffer ON, CL ≤ 50 pF, RL ≥ 5 kΩ,

1 kHz, BW = 500 kHz

70.6

DAC output buffer OFF, CL ≤ 50 pF, no RL, 1 kHz,

BW = 500 kHz

-72

THD

Total harmonic

distortion(6)

DAC output buffer ON, CL ≤ 50 pF, RL ≥ 5 kΩ, 1 kHz

-79

DAC output buffer OFF, CL ≤ 50 pF, no RL, 1 kHz

-81

SINAD

Signal-to-noise and

distortion ratio(6)

DAC output buffer ON, CL ≤ 50 pF, RL ≥ 5 kΩ, 1 kHz

70.1

DAC output buffer OFF, CL ≤ 50 pF, no RL, 1 kHz

71.5

ENOB

Effective number

of bits

DAC output buffer ON, CL ≤ 50 pF, RL ≥ 5 kΩ, 1 kHz

11.3

bits

DAC output buffer OFF, CL ≤ 50 pF, no RL, 1 kHz

11.6

1. Specified by design. Not tested in production.

2. Difference between two consecutive codes minus 1 LSB.

3. Difference between the value measured at code i and the value measured at code i on a line drawn between code 0 and

last code 4095.

4. Difference between the value measured at code (0x001) and the ideal value.

5. Difference between the ideal transfer-function slope and the measured slope computed from code 0x000 and 0xFFF when

the buffer is OFF, and from code giving 0.2 V and (VREF+ - 0.2 V) when the buffer is ON.

6. Signal is -0.5 dBFS with Fsampling = 1 MHz.

Table 105. DAC accuracy(1) (continued)

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

Table 106. VREFBUF characteristics(1)

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

VDDA

Analog supply

voltage

Normal mode

VRS = 000

1.8

3.6

VRS = 001

2.1

VRS = 010

2.4

VRS = 011

2.8

Degraded

mode(2)

VRS = 000

1.62

-1.8

VRS = 001

2.1

VRS = 010

2.4

VRS = 011

2.8

VREFBUF_

OUT

(3)

Voltage reference

buffer output

Normal mode at

VDDA = 3 V,

TJ = 30 °C,

Iload = 10 µA

VRS = 000

1.496

1.5

1.504

VRS = 001

1.795

1.8

1.805

VRS = 010

2.042

2.048

2.054

VRS = 011

2.493

2.5

2.507

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