Datasheet

MCP4921/4922
DS21897A-page 4  2004 Microchip Technology Inc.
Input Capacitance –
Unbuffered Mode
C
VREF
—7 — pF
Multiplier Mode
-3 dB Bandwidth
f
VREF
— 440 — kHz V
REF
= 2.048V ±0.1 Vp-p, unbuffered,
G = 1
f
VREF
— 390 — kHz V
REF
= 2.048V ±0.1 Vp-p, unbuffered,
G = 2
Multiplier Mode –
Total Harmonic Distortion
THD
VREF
—-73 — dBV
REF
= 2.5V ±0.1 Vp-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
—14 24 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
3V AC/DC CHARACTERISTICS (CONTINUED)
Electrical Specifications: Unless otherwise indicated, V
DD
= 3V, AV
SS
= 0V, V
REF
= 2.048V external, output buffer gain (G) = 1x,
R
L
= 5 kΩ to GND, C
L
= 100 pF T
A
= -40 to +85°C. Typical values at 25°C
Parameters Sym Min Typ Max Units Conditions
Note 1: By design, not production tested.
2: Too small to quantify.
5V EXTENDED TEMPERATURE SPECIFICATIONS
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
Power Requirements
Input Voltage V
DD
2.7 — 5.5
Input Current - MCP4921
Input Current - MCP4922
I
DD
—
—
200
400
—
—
µA Input unbuffered, digital inputs
grounded, output unloaded,
code at 0x000
Hardware Shutdown Current I
SHDN
—1.5— µA
Software Shutdown Current I
SHDN_SW
—5— µA
Power-On Reset threshold V
POR
—1.85— V
DC Accuracy
Resolution n 12 — — Bits
INL Error INL — ±4 — LSB
DNL DNL — ±0.25 — LSB Device is Monotonic
Offset Error V
OS
— ±0.02 — % of FSR Code 0x000h
Offset Error Temperature
Coefficient
V
OS
/°C — -5 — ppm/°C +25°C to +125°C
Note 1: By design, not production tested.
2: Too small to quantify.