Datasheet

 2004 Microchip Technology Inc. DS21897A-page 5
MCP4921/4922
Gain Error g
E
— -0.10 — % of FSR Code 0xFFFh, not including offset
error
Gain Error Temperature
Coefficient
∆G/°C — -3 — ppm/°C
Input Amplifier (V
REF
Input)
Input Range - Buffered Mode V
REF
— 0.040 to
V
DD
-
0.040
—VNote 1
Code = 2048,
V
REF
= 0.2v p-p, f = 100 Hz and 1 kHz
Input Range - Unbuffered
Mode
V
REF
0—V
DD
V
Input Impedance R
VREF
— 174 — kΩ Unbuffered Mode
Input Capacitance -
Unbuffered Mode
C
VREF
—7— pF
Multiplying Mode
-3 dB Bandwidth
f
VREF
— 450 — kHz V
REF
= 2.5V ±0.1 Vp-p, Unbuffered,
G=1
f
VREF
— 400 — kHz V
REF
= 2.5V ±0.1 Vp-p, Unbuffered,
G = 2
Multiplying Mode - Total
Harmonic Distortion
THD
VREF
——— dBV
REF
= 2.5V ±0.1Vp-p,
Frequency = 1 kHz
Output Amplifier
Output Swing V
OUT
— 0.010 to
V
DD
–
0.040
— Accuracy is better than 1 LSB for
V
OUT
= 10 mV to (V
DD
– 40 mV)
Phase Margin
θm — 66 — degrees
Slew Rate SR — 0.55 — V/µs
Short Circuit Current I
SC
—17— mA
Settling Time t
settling
— 4.5 — µs Within 1/2 LSB of final value from 1/4
to 3/4 full-scale range
Dynamic Performance
DAC to DAC Crosstalk — 10 — nV-s Note 2
Major Code Transition Glitch — 45 — nV-s 1 LSB change around major carry
(0111...1111 to 1000...0000)
Digital Feedthrough — 10 — nV-s Note 2
Analog Crosstalk — 10 — nV-s Note 2
5V EXTENDED TEMPERATURE SPECIFICATIONS (CONTINUED)
Electrical Specifications: Unless otherwise indicated, V
DD
= 5V, AV
SS
= 0V, V
REF
= 2.048V, output buffer gain (G) = 2x, R
L
= 5 kΩ
to GND, C
L
= 100 pF. Typical values at +125°C by characterization or simulation.
Parameters Sym Min Typ Max Units Conditions
Note 1: By design, not production tested.
2: Too small to quantify.