MAXIM DS4305 Technical data

General Description

The DS4305 is a nonvolatile (NV) sample-and-infinite­hold adjustable voltage reference. The reference volt­age is programmed in-circuit during factory calibration/
programming. Programming the reference voltage,
V

OUT

, is as simple as applying the desired voltage on

V

IN

and toggling the adjust pin (ADJ) to lock the V

OUT

voltage level indefinitely, even if the device is power
cycled. The DS4305 replaces current cumbersome fac­tory adjustment arrangements with a low-cost solution
that can be adjusted using automated techniques. In
addition, the DS4305 has the ability to be readjusted
after the unit has been fully assembled and tested. This
results in a much more flexible manufacturing arrange­ment, lower inventory costs, and a quicker time-to-market.

Applications

Power-Supply Calibration

Threshold Setting

Offset Nulling

Bias Adjusting

Power Amps

Pressure Bridges

Factory-Calibrated Equipment

Features

♦ Precise Electronically Adjustable Voltage

Reference

♦ Enables Automated Factory Trimming of Devices

Needing Voltage Adjustment

♦ Can be Adjusted to Within ±1.5mV

♦ Wide Adjustable Output Voltage Range Within

300mV of the Supply Rails

♦ Low Temperature Coefficient

♦ ±1mA of Output-Current Drive

♦ NV Memory Stores the Voltage Indefinitely

♦ Output Short-Circuit Protection

♦ Low Cost

♦ Low Power Consumption

♦ 4.0V to 5.5V Single-Supply Operation

♦ Small 5-Lead SOT23 Package

♦ -40°C to +125°C Temperature Operation

♦ DS4305K Evaluation Kit is Available

DS4305

Sample-and-Infinite Hold

Voltage Reference

______________________________________________ Maxim Integrated Products 1

GND

V

OUT

V

IN

15V

CC

ADJ

DS4305

SOT23

TOP VIEW

2

34

Pin Configuration

Ordering Information

SHUNT

VOLTAGE

REFERENCE

ACCESS FOR
AUTOMATED

ALIGNMENT

REFERENCE
VOLTAGE

REFERENCE
VOLTAGE

HAND-SELECTED

0.1% RESISTOR
OR MECHANICAL POT

EXISTING SOLUTION DS4305 SOLUTION

V

CC

GND

V

OUT

VINADJ

V

CC

DS4305

Typical Operating Circuit

Rev 0; 1/06

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

EVALUATION KIT

AVAILABLE

PART

TEMP RANGE

PIN­PACKAGE

SOT

MARK

DS4305R+T&R

5 SOT23

4305+

+Denotes lead-free package.

查询DS4305供应商

-40°C to +125°C

DS4305

Sample-and-Infinite Hold
Voltage Reference

2 _____________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

RECOMMENDED OPERATING CONDITIONS

(TA= -40°C to +125°C)

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.

Voltage on VCCRelative to GND...........................-0.5V to +6.0V

Voltage on V

IN

, ADJ, and V

OUT

Relative to GND ...-0.5V to (VCC+ 0.5V), not to exceed +6.0V

Operating Temperature Range .........................-40°C to +125°C

EEPROM Programming Adjust Temperature..........0°C to +70°C

V

OUT

to GND Short-Circuit Duration .........................Continuous

Storage Temperature Range .............................-55°C to +125°C

Soldering Temperature ...See IPC/JEDEC J-STD-020 Specification

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Supply Voltage V

CC

(Note 1) 4.0 5.5 V

VIN Voltage Range V

IN

0.3

V

ADJ Logic 0 V

IL

V

V

OUT

Current V

OUTI

-1 +1 mA

V

OUT

Load V

OUTL

100 pF

ELECTRICAL CHARACTERISTICS

(VCC= +4.0V to +5.5V, TA= -40°C to +125°C, unless otherwise noted.)

PARAMETER

CONDITIONS

UNITS

-40°C to +85°C; VIN, ADJ, and
V

OUT

= open circuit

1.4 2.0

Supply Current I

IN

+85°C to +125°C; VIN, ADJ, and
V

OUT

= open circuit

2.1

mA

VIN Resistance R

PD

95 kΩ

ADJ Pullup Resistance R

PU

18 kΩ

V

OUT

Voltage Range V

OUTR

(Note 1) 0.3

V

V

OUT

Tracking Accuracy V

OUTTA

(Note 2) ±20 mV

V

OUT

Quantization V

OUTQ

(Note 3)

mV

-40°C to +85°C, V

OUT

= 0.7V

µV/°C

-40°C to +25°C, V

OUT

= 5.0V, V

CC ≥ 5.3V

73460

+25°C to +85°C, V

OUT

= 5.0V, V

CC ≥ 5.3V

-24 -7

V

OUT

Temperature Coefficient

+85°C to +125°C, V

OUT

= 5.0V, V

CC ≥ 5.3V

-43 -23 -3

ppm/°C

-40°C to +85°C

V

OUT

Line Regulation

+85°C to +125°C

mV/V

-40°C to +85°C, -1mA ≤ V

OUT I

≤ +1mA 2.0

V

OUT

Load Regulation

+ 85°C to + 125°C , - 1.0m A ≤ V

OU T I

≤ + 1.0m A 2.5

mV/mA

Long-Term Stability

1000 hours at +25°C

ppm

e

n1

0.1Hz ≤ f ≤ 10Hz

µV

P-P

V

OUT

Noise

e

n2

10Hz ≤ f ≤ 1kHz 23

µV

RMS

V

- 0.3

CC

-0.3 0.3 x V

CC

SYMBOL

MIN TYP MAX

V

OUT TC

±56

V

OUT LN

V

OUT LD

V

OUTLTS

-1.6 +1.8

-1.6

160

V

C C

±1.5

+10

+1.8

- 0.3

DS4305

Sample-and-Infinite Hold

Voltage Reference

_____________________________________________________________________ 3

ACTIVE SUPPLY CURRENT

vs. TEMPERATURE (V

OUT

= 0.3V)

DS4305 toc01

TEMPERATURE (°C)

SUPPLY CURRENT (mA)

1.1

1.2

1.3

1.4

1.5

1.6

1.0

VCC = 5.5V

VCC = 5.0V

VCC = 4.0V

IL = 0mA ADJ = V

CC

805020-10-40 110

1.2

1.3

1.4

1.5

1.6

1.7

1.8

1.1

ACTIVE SUPPLY CURRENT

vs. TEMPERATURE (V

OUT

= 3.5V)

DS4305 toc02

TEMPERATURE (°C)

SUPPLY CURRENT (mA)

805020-10-40 110

VCC = 4.0V

VCC = 5.0V

VCC = 5.5V

IL = 0mA ADJ = V

CC

ACTIVE SUPPLY CURRENT

vs. SUPPLY VOLTAGE (V

OUT

= 0.3V)

DS4305 toc03

SUPPLY VOLTAGE (V)

SUPPLY CURRENT (mA)

5.24.94.64.3

1.1

1.2

1.3

1.4

1.5

1.6

1.0

4.0 5.5

TA = +85°C

TA = +125°C

TA = +25°C

TA = -40°C

IL = 0mA

Typical Operating Characteristics

(VCC= 5.0V, TA= +25°C, unless otherwise noted.)

Note 1: All voltages referenced to ground.
Note 2: Tracking accuracy is defined as V

OUT

- VINafter the DS4305 has completed self-adjustment.

Note 3: Quantization refers to the size of the voltage steps used to track the input signal.
Note 4: Settling time is the maximum amount of time V

OUT

requires to self-adjust. The settling time is determined by the following

formula: ∆V

OUT

x tST.

Note 5: EEPROM programming time is the hold time required after the DS4305 has completed self-adjustment before V

IN

or V

CC

can be removed or before ADJ can be toggled low once again.

Note 6: Turn-on time is defined as the time required for V

OUT

to reach its specified accuracy after the required supply voltage is

applied.

Note 7: V

OUT

not loaded.

Note 8: Guaranteed by design.

NONVOLATILE MEMORY CHARACTERISTICS

(VCC= +4.0V to 5.5V, unless otherwise noted.)

PARAMETER

CONDITIONS

UNITS

Programming Cycles +70°C (Note 8)

Cycles

ELECTRICAL CHARACTERISTICS (continued)

(VCC= +4.0V to +5.5V, TA= -40°C to +125°C, unless otherwise noted.)

PARAMETER

CONDITIONS

UNITS

V

OUT

PSRR

f = 200kHz 28 dB

t

ST

(Note 4) 7 10

ms/V

EEPROM Programming Time t

W

(Note 5) 9 12 ms

Turn-On Time t

ON

VIN and ADJ = open circuit (Note 6) 10 µs

ADJ Toggle Low Time t

ADJ

ns

+25°C, V

CC

= 5.8V (Note 7)

mV

V

Self-Adjust Settling Time

OUT

V

Factory-Trimmed Value V

OUT

SYMBOL

V

OUTPSRR

OUT FT

MIN TYP MAX

100

1200

SYMBOL

MIN TYP MAX

50,000