米6体育平台手机版

SLOS358C September 2011 – April 2020 THS4531

PRODUCTION DATA.

封装选项

机械数据 (封装 | 引脚)

RUN|10
- MPQF225C
D|8
- MSOI002K
DGK|8
- MPDS028E

散热焊盘机械数据 (封装 | 引脚)

RUN|10
- QFND329A

订购信息

11.1 Typical Characteristics Test Circuits

Figure 67 shows the general test circuit built on the EVM that was used for testing the THS4531. For simplicity, power supply decoupling is not shown – please see layout in the applications section for recommendations. Depending on the test conditions, component values are changed per Table 3 and Table 4, or as otherwise noted. Some of the signal generators used are ac coupled 50 Ω sources and a 0.22 µF cap and 49.9 Ω resistor to ground are inserted across R_IT on the un-driven or alternate input as shown to balance the circuit. Split-power supply is used to ease the interface to common lab test equipment, but if properly biased, the amplifier can be operated single-supply as described in the applications section with no impact on performance. For most of the tests, the devices are tested with single ended input and a transformer on the output to convert the differential output to single ended because common lab test equipment have single ended inputs and outputs. Performance is the same or better with differential input and differential output.

Figure 67. General Test Circuit

Table 3. Gain Component Values for Single-Ended Input⁽¹⁾

GAIN	R_F	R_G	R_IT
1 V/V	2 kΩ	2 kΩ	51.1 Ω
2 V/V	2 kΩ	1 kΩ	52.3 Ω
5 V/V	2 kΩ	392 Ω	53.6 Ω
10 V/V	2 kΩ	187 kΩ	57.6 Ω

(1) Note components are chosen to achieve gain and 50-Ω input termination. Resistor values shown are closest standard values so gains are approximate.

Table 4. Load Component Values For 1:1 Differential to Single-Ended Output Transformer⁽¹⁾

R_L	R_O	R_OT	ATTEN
100 Ω	25 Ω	open	6
200 Ω	86.6 Ω	69.8 Ω	16.8
499 Ω	237 Ω	56.2 Ω	25.5
1 kΩ	487 Ω	52.3 Ω	31.8
2 kΩ	976 Ω	51.1 Ω	37.9

(1) Note the total load includes 50-Ω termination by the test equipment. Components are chosen to achieve load and 50-Ω line termination through a 1:1 transformer. Resistor values shown are closest standard values so loads are approximate.

Due to the voltage divider on the output formed by the load component values, the amplifier’s output is attenuated. The column Atten in Table 4 shows the attenuation expected from the resistor divider. When using a transformer at the output as shown in Figure 67, the signal will see slightly more loss due to transformer and line loss, and these numbers will be approximate. The standard output load used for most tests is 2 kΩ with associated 37.9 dB of loss.