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Specifications

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Document Number: 38-12018 Rev. AH Page 29 of 64
10.3.7 DC Analog Reference Specifications
The following tables list guaranteed maximum and minimum specifications for the voltage and temperature ranges: 4.75 V to 5.25 V
and –40 °C T
A
85 °C, or 3.0 V to 3.6 V and –40 °C T
A
85 °C, respectively. Typical parameters apply to 5 V and 3.3 V at 25 °C
and are for design guidance only.
The guaranteed specifications for RefHI and RefLo are measured through the Analog Continuous Time PSoC blocks. The power
levels for RefHi and RefLo refer to the Analog Reference Control register. AGND is measured at P2[4] in AGND bypass mode. Each
Analog Continuous Time PSoC block adds a maximum of 10mV additional offset error to guaranteed AGND specifications from the
local AGND buffer. Reference control power can be set to medium or high unless otherwise noted.
Note Avoid using P2[4] for digital signaling when using an analog resource that depends on the Analog Reference. Some coupling
of the digital signal may appear on the AGND.
Table 19. 5-V DC Analog Reference Specifications
Reference
ARF_CR
[5:3]
Reference Power
Settings
Symbol Reference Description Min Typ Max Units
0b000 RefPower = high
Opamp bias = high
V
REFHI
Ref High V
DD
/2 + Bandgap V
DD
/2 + 1.229 V
DD
/2 + 1.290 V
DD
/2 + 1.346 V
V
AGND
AGND V
DD
/2 V
DD
/2 – 0.038 V
DD
/2 V
DD
/2 + 0.040 V
V
REFLO
Ref Low V
DD
/2 – Bandgap V
DD
/2 – 1.356 V
DD
/2 – 1.295 V
DD
/2 – 1.218 V
RefPower = high
Opamp bias = low
V
REFHI
Ref High V
DD
/2 + Bandgap V
DD
/2 + 1.220 V
DD
/2 + 1.292 V
DD
/2 + 1.348 V
V
AGND
AGND V
DD
/2 V
DD
/2 – 0.036 V
DD
/2 V
DD
/2 + 0.036 V
V
REFLO
Ref Low V
DD
/2 – Bandgap V
DD
/2 – 1.357 V
DD
/2 – 1.297 V
DD
/2 – 1.225 V
RefPower = medium
Opamp bias = high
V
REFHI
Ref High V
DD
/2 + Bandgap V
DD
/2 + 1.221 V
DD
/2 + 1.293 V
DD
/2 + 1.351 V
V
AGND
AGND V
DD
/2 V
DD
/2 – 0.036 V
DD
/2 V
DD
/2 + 0.036 V
V
REFLO
Ref Low V
DD
/2 – Bandgap V
DD
/2 – 1.357 V
DD
/2 – 1.298 V
DD
/2 – 1.228 V
RefPower = medium
Opamp bias = low
V
REFHI
Ref High V
DD
/2 + Bandgap V
DD
/2 + 1.219 V
DD
/2 + 1.293 V
DD
/2 + 1.353 V
V
AGND
AGND V
DD
/2 V
DD
/2 – 0.037 V
DD
/2 – 0.001 V
DD
/2 + 0.036 V
V
REFLO
Ref Low V
DD
/2 – Bandgap V
DD
/2 – 1.359 V
DD
/2 – 1.299 V
DD
/2 – 1.229 V
0b001 RefPower = high
Opamp bias = high
V
REFHI
Ref High P2[4]+P2[6] (P2[4] =
V
DD
/2, P2[6] = 1.3 V)
P2[4] + P2[6] –
0.092
P2[4] + P2[6] –
0.011
P2[4] + P2[6] +
0.064
V
V
AGND
AGND P2[4] P2[4] P2[4] P2[4] –
V
REFLO
Ref Low P2[4]–P2[6] (P2[4] =
V
DD
/2, P2[6] = 1.3 V)
P2[4] – P2[6] –
0.031
P2[4] – P2[6] +
0.007
P2[4] – P2[6] +
0.056
V
RefPower = high
Opamp bias = low
V
REFHI
Ref High P2[4]+P2[6] (P2[4] =
V
DD
/2, P2[6] = 1.3 V)
P2[4] + P2[6] –
0.078
P2[4] + P2[6] –
0.008
P2[4] + P2[6] +
0.063
V
V
AGND
AGND P2[4] P2[4] P2[4] P2[4] –
V
REFLO
Ref Low P2[4]–P2[6] (P2[4] =
V
DD
/2, P2[6] = 1.3 V)
P2[4] – P2[6] –
0.031
P2[4] – P2[6] +
0.004
P2[4] – P2[6] +
0.043
V
RefPower = medium
Opamp bias = high
V
REFHI
Ref High P2[4]+P2[6] (P2[4] =
V
DD
/2, P2[6] = 1.3 V)
P2[4] + P2[6] –
0.073
P2[4] + P2[6] –
0.006
P2[4] + P2[6] +
0.062
V
V
AGND
AGND P2[4] P2[4] P2[4] P2[4] –
V
REFLO
Ref Low P2[4]–P2[6] (P2[4] =
V
DD
/2, P2[6] = 1.3 V)
P2[4] – P2[6] –
0.032
P2[4] – P2[6] +
0.003
P2[4] – P2[6] +
0.038
V
RefPower = medium
Opamp bias = low
V
REFHI
Ref High P2[4]+P2[6] (P2[4] =
V
DD
/2, P2[6] = 1.3 V)
P2[4] + P2[6] –
0.073
P2[4] + P2[6] –
0.006
P2[4] + P2[6] +
0.062
V
V
AGND
AGND P2[4] P2[4] P2[4] P2[4] –
V
REFLO
Ref Low P2[4]–P2[6] (P2[4] =
V
DD
/2, P2[6] = 1.3 V)
P2[4] – P2[6] –
0.034
P2[4] – P2[6] +
0.002
P2[4] – P2[6] +
0.037
V