PIC16F684-ESLASHST datasheet(146/164 Pages) MICROCHIP

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PIC16F684

DS41202C-page 144

Preliminary

 2004 Microchip Technology Inc.

TABLE 15-8:

COMPARATOR VOLTAGE REFERENCE SPECIFICATIONS

TABLE 15-9:

PIC16F684 A/D CONVERTER CHARACTERISTICS:

Voltage Reference Specifications

Standard Operating Conditions (unless otherwise stated)

Operating temperature

-40°C

≤ TA ≤ +125°C

Sym.

Characteristics

Min

Typ

Max

Units

Comments

Resolution

—

VDD/24*

VDD/32

—

LSb

Low Range (VRR = 1)

High Range (VRR = 0)

Absolute Accuracy

—

± 1/4*

± 1/2*

LSb

Low Range (VRR = 1)

High Range (VRR = 0)

Unit Resistor Value (R)

—

2K*

—

Ω

Settling Time(1)

——

10*

µs

These parameters are characterized but not tested.

Note 1:

Settling time measured while VRR = 1 and VR<3:0> transitions from ‘0000’ to ‘1111’.

Standard Operating Conditions (unless otherwise stated)

Operating temperature

-40°C

≤ TA ≤ +125°C

Param

No.

Sym

Characteristic

Min

Typ†

Max

Units

Conditions

A01

Resolution

—

10 bits

bit

A02

EABS

Total Absolute

Error*(1)

——

±1LSb VREF = 5.0V

A03

EIL

Integral Error

—

±1LSb VREF = 5.0V

A04

EDL

Differential Error

—

±1

LSb No missing codes to 10 bits

VREF = 5.0V

A05

EFS

Full-scale Range

2.2*

—

5.5*

A06

EOFF

Offset Error

—

±1LSb VREF = 5.0V

A07

EGN

Gain Error

—

±1LSb VREF = 5.0V

A10

—

Monotonicity

—

guaranteed(2)

——

VSS

≤ VAIN ≤ VREF+

A20

A20A

VREF

Reference Voltage

2.2

2.5

——

VDD + 0.3

Absolute minimum to ensure 10-bit

accuracy

A25

VAIN

Analog Input

Voltage

VSS

—VREF

A30

ZAIN

Recommended

Impedance of

Analog Voltage

Source

——

Ω

A50

IREF

VREF Input

Current*(3)

—

1000

µA During VAIN acquisition.

Based on differential of VHOLD to

VAIN.

——

µA During A/D conversion cycle.

These parameters are characterized but not tested.

† Data in ‘Typ’ column is at 5.0V, 25

°C unless otherwise stated. These parameters are for design guidance

only and are not tested.

Note 1:

Total Absolute Error includes integral, differential, offset and gain errors.

The A/D conversion result never decreases with an increase in the input voltage and has no missing codes.

VREF current is from external VREF or VDD pin, whichever is selected as reference input.

When A/D is off, it will not consume any current other than leakage current. The power-down current

specification includes any such leakage from the A/D module.

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