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Status
Part Number	Status
DS2450	Active: In Production. But some versions of the family are No Longer Available. See Ordering Information.

Data Sheet

FULL DATA SHEET (PDF, 708kB) Download   E-Mail

Description

The DS2450 1-Wire® Quad A/D Converter is based on a successive-approximation analog to digital converter with a four to one analog multiplexer. Each input channel has its own register set to store the input voltage range, resolution, and alarm threshold values as well as flags to enable participation of the device in the conditional search if the input voltage leaves the specified range. Two alarm flags for each channel indicate if the voltage measured was too high or too low without requiring the bus master to do the comparison. Each A/D conversion is initiated by the bus master. A channel not used as analog input can serve as a digital open-drain output. After disabling the input the bus master can directly switch on or off the open-drain transistor at the selected channel. All device settings are stored in SRAM and kept non-volatile while the device gets power either through the 1-Wire bus or through its VCC pin. After powering up, a power-on reset flag signals the bus master the need to restore the device settings before the regular operation can resume. All device registers and conversion read-out registers are organized as three 8-byte memory pages similar to the Status Memory of a DS2505/6 device. An on-chip CRC16 generator protects the communication against transmission errors when reading through the end of a memory page as well as when writing individual bytes.

Key Features

Four high-impedance inputs to measure analog voltages over the 1-Wire bus User programmable input range (2.56V, 5.12V), resolution (1 to 16 bits) and alarm thresholds 5V, single supply operation Very low power: 2.5mW active, 25µW idle Built-in multidrop controller allows multiple DS2450's to be identified and operated on a common 1-Wire bus Responds to Conditional Search if the analog voltage crosses the alarm thresholds Channels not used as analog input can serve as open drain digital outputs for closed-loop control Directly connects to a single port pin of a microprocessor and communicates at up to 16.3k bits per second Overdrive mode boosts communication speed to 142k bits per second On-chip 16-bit CRC-generator for safeguarding data transfers Unique, factory-lasered and tested 64-bit registration number (8-bit family code + 48-bit serial number 8-bit CRC tester) assures absolute traceability because no two parts are alike 8-bit family code specifies device communication requirements to bus master Operating temperature range from -40°C to +85°C Compact, low cost 8-pin SOIC surface mount package

Key Specifications:  Precision ADCs (< 5Msps)

Part Number

Resolution (bits)

Input Chan.

Conv. Rate (ksps)

Conv. Time (µs)

Data Bus (bits)

Ref. (V)

VIN (V)

Diff. Inputs

VSUPPLY (V)

ICC (mA)

Power (mW)

Standby Mode

Package/Pins

Price

ADC

max

typ

typ

See Notes

DS2450

16

4

1

1440

1-Wire

Int.

2.56 5.12

No

5

0.5

2.5

Yes

SOIC (W)/8

$2.62 @1k

See All Precision ADCs (< 5Msps) (377)

Diagram

Block Diagram

Application Notes

Application Note 27: Understanding and Using Cyclic Redundancy Checks with Maxim iButton Products - DS2450 Application Note 74: Reading and Writing 1-Wire® Devices Through Serial Interfaces - DS2450 Application Note 126: 1-Wire® Communication Through Software - DS2450 Application Note 148: Guidelines for Reliable Long Line 1-Wire® Networks - DS2450 Application Note 155: 1-Wire® Software Resource Guide Device Description - DS2450 Application Note 158: 1-Wire® Tagging with XML - DS2450 Application Note 187: 1-Wire Search Algorithm - DS2450 Application Note 192: Using the DS2480B Serial 1-Wire Line Driver - DS2450 Application Note 244: Advanced 1-Wire Network Driver - DS2450 Application Note 1097: White Paper 2: Using the 1-Wire® Public Domain Kit - DS2450 Application Note 1100: White Paper 5: Using 1-Wire APIs for Data Sheet Commands - DS2450 Application Note 3989: Add Control, Memory, Security, and Mixed-Signal Functions with a Single Contact - DS2450 Application Note 4255: How to Power the Extended Features of 1-Wire® Devices - DS2450

Design Guides

1-Wire® Products (PDF)

Reliability Reports

Reliability Report: DS2450.pdf

Software/Models

none

Ordering Information

Notes: Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day. Part number suffixes: T or T&R = tape and reel;+ = RoHS/lead-free;# = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.

Devices: 1-4 of 4

DS2450	Free Sample	Buy	Status	Recommended Replacement	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
DS2450S/T&R		N/A	No Longer Available	DS2450	Land Pattern: Not Available	-40°C to +85°C	See data sheet
DS2450S		N/A	No Longer Available	DS2450S+	SOIC (W);8 pin;44 mm² Land Pattern: Not Available Use pkgcode/variation: W8+3*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS2450S+			Active		SOIC (W);8 pin;44 mm² Land Pattern: Not Available Use pkgcode/variation: W8+3*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS2450S+T&R			Active		SOIC (W);8 pin;44 mm² Land Pattern: Not Available Use pkgcode/variation: W8+3*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis

Related Products

More Like This: View Product Families for Similar Products See All Precision ADCs (< 5Msps) (377 Products)

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Technical Documents

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Description   Key Features   Applications/Uses   Key Specifications   Diagram

Data Sheet   Application Notes   Design Guides   Engineering Journals   Reliability Reports   Software/Models   Evaluation Kits

Price and Availability   Samples   Buy Online   Package Information   Lead-Free Information

Related Products   Notes and Comments   Evaluation Kits

2006-11-27
This page last modified: 2009-10-15