The AD537 is a monolithic V-F converter consisting of an input amplifier, a precision oscillator system, an accurate internal reference generator and a high current output stage. Only a single external RC network is required to set up any full-scale (F.S.) frequency up to 100 kHz and any F.S. input voltage up to ±30 V. Linearity error is as low as ±0.05% for 10 kHz F.S., and operation is guaranteed over an 80 dB dynamic range. The overall temperature coefficient (excluding the effects of external components) is typically ±30 ppm/°C. The AD537 operates from a single supply of 5 V to 36 V and consumes only 1.2 mA quiescent current.

A temperature-proportional output, scaled to 1.00 mV/K, enables the circuit to be used as a reliable temperature-to-frequency converter; in combination with the fixed reference output of 1.00 V, offset scales such as 0°C or 0°F can be generated.

The low drift (1µV/°C typ) input amplifier allows operation directly from small signals (e.g., thermocouples or strain gages) while offering a high (250 M(Ohm) input resistance. Unlike most V-F converters, the AD537 provides a square-wave output, and can drive up to 12 TTL loads, LEDs, very long cables, etc.

The excellent temperature characteristics and long-term stability of the AD537 are guaranteed by the primary bandgap reference generator and the low T.C. silicon chromium thin film resistors used throughout.

The device is available in either a TO-116 ceramic DIP or a TO-100 metal can; both are hermetically sealed packages.

The AD537 is available in three performance/temperature grades; the J and K grades are specified for operation over the 0°C to +70°C range while the AD537S is specified for operation over the extended temperature range, -55°C to +125°C.

*Protected by Patent Nos. 3,88,963 and RE 20,586.

Part#	Architecture	# Channels	Input Voltage Range (V)	Full Scale Fout (kHz)	Reference Voltage (V)	Accuracy (%/kHz)	Input Clk Frequency (MHz)	Voltage Supply (V)	Supply Current (max)	Package	Price* (1000-4999)
AD537	Non-Synchronous	1-Single Ended	±11	150	1	0.25	-	+/- 5 to +/- 18	2.5	14-Lead CerDIP	$9.65
AD650	Non-Synchronous	1-Single Ended	+11	1000	-	0.1	-	+/- 9 to +/- 18	8	14-Lead CerDIP, 14-Lead PDIP, 20-Lead PLCC	$8.02
AD652	Synchronous	1-Single Ended	±10	2500	5	2	5	+/- 6 to +/- 15	15	20-Lead PLCC	$9.92
AD654	Non-Synchronous	1-Single Ended	±14	500	-	0.4	-	+/- 5 to +/- 18	2.5	8-Lead PDIP, 8-Lead SOIC	$3.76
AD7740	Synchronous	1-Single Ended	+2.5	500	2.5	1	1	3 to 5.25	1.5	8-Lead MSOP, 8-Lead SOT-23	$0.91
AD7741	Synchronous	1-Single Ended	+2.5	3072	2.5	2	6.144	4.75 to 5.25	8	8-Lead PDIP, 8-Lead SOIC	$1.76
AD7742	Synchronous	2-Differential, 3-Pseudo Differential	+3.5	3072	2.5	2	6.144	4.75 to 5.25	8	16-Lead PDIP, 16-Lead SOIC	-
ADVFC32	Non-Synchronous	1-Single Ended	+10	500	-	0.2	-	+/- 9 to +/- 18	8	14-Lead PDIP	$6.14

* The pricing listed here is provided only for budgetary purposes as recommended list price in U.S. Dollars in the United States ex factor per unit for the stated volume. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
** Pricing is currently unavailable. Click on the product number to see the Product Page for additional information.

产品型号是指能够购买或者索取样片的某类产品的具体型号。

产品状态指该产品当前的生存周期。它指下面四个阶段之一：

• 预发布：该产品型号尚未投入正式生产，但是可以提供样片。
• 生产：该产品型号目前已在生产，可以购买和索取样片。
• 停产前限时购买：该型号已经计划停产，但仍然可以在限定的时间内购买。
• 停产：该型号产品已经停产，不再提供。本表格中列出的其它型号产品仍可以供货（如果这些型号不处于停产状态）。

这种集成电路（IC）的封装说明，例如：DIP，SOIC和BGA封装。评估板是一块用来演示器件性能的试验板，该器件也包含在该评估板上。

欲详细了解封装图和化学成份请访问：  封装网页

引脚数是指该器件的引脚、球状焊点或焊盘的数量。产品技术资料中提供引脚排列图和引脚功能描述。

这是指该器件允许的工作温度范围。以下为所规定的三种温度范围：

• 民用温度范围：0 ºC～＋70 ºC
• 军用温度范围：－55ºC ～＋125ºC
• 工业用温度范围：不同型号的产品的温度范围可能不同。欲了解更多信息，请查阅产品技术资料。
• 汽车工作温度范围：-40 ℃～ +125 ℃

这里所列出的美国报价单仅供预算参考，指美元报价（规定订量的每片美元，美国离岸价），如有修改不再另行通知。由于地区关税、商业税、汇率及手续费原因，国际报价可能不同。对于特殊批量报价，请与您当地的ADI公司办事处或代理商联络。对于评估板和套件的报价是指一个单位价格。

该日期为美国模拟器件公司的预期仓库发货时间。大多数定单将在该日期后48小时内运出。定单一经发出，美国模拟器件公司将发出确认邮件以确认交货日期 。在输入定单的页面，请务必留意计划到岸日。我们接受期货定单，但送货日期将按工厂计划延期而定。所定产品的仓储地也应留意。我们在美国、欧洲和东南亚均设有仓库。运货时间因仓库地址不同而有所差异。

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