Features

● Balanced output

● Low distortion: 0.0005%at f 1kHz

● Wide output swing: 17VRMS to 600 [123 ]

● High -capacity load driver

● High conversion rate: 15V/μs

● The range of power supply is wide: ± 4.5V to ± 18V

● Low static static Current: ± 5.2ma

● 8-needle DIP, SO-8 and SOL-16 package

● Audio differential line receiver supporting: Ina134 and INA137

● Improved improvement SSM2142 alternative

Application

● Audio difference line drive

● Audio mixing console

● Allocate amplifier

● Graphic/Parameter Balancer

● Dynamic range processor

● Digital effect processor

● Telecom system

● Gaobaozhen equipment

[ 123] ● Industrial instrument

Instructions

DRV134

and DRV135 are differential output amplifiers, converting single -end input into a balanced output pair. These balanced audio drives consist of high -performance computing amplifiers and precision resistance on the chip. They are completely suitable for high -performance audio applications and have excellent communication specifications, including low distortion (0.0005%at 1kHz) and high conversion rate (15V/μs). The resistance on the tablet has been fine -tuned by laser to obtain accurate gain and best output co -model suppression. The wide output voltage and high output driving capacity allows applications that are required in various requirements. They can easily drive large capacitor loads related to long audio cables. Combined with INA134 or INA137 differential receiver, they provide a complete solution for the transmission simulation audio signal.

DRV134 has 8-needle DIP and SOL-16 surface installation and packaging. DRV135 uses space-saving SO-8 surface installation components. Both equipment stipulates that it runs under the extended industrial temperature range (-40 ° C to+85 ° C) and runs within the range of -55 ° C to+125 ° C.

Typical performance curve

In TA +25 ° C, vs ± 18V, RL 600 The difference between the connection between the connection is unless there is another explanation.

Application information

DRV134 (and DRV135 in SO-8 packaging converts single-end and ground reference input into a floating differential output with+6dB gain (g 2). Figure 1 shows the basic connection required for the operation. In the application of noise or high impedance power supply, it is strongly recommended to place off -coupled power containers near the device pin.

DRV134 is composed of an input inverter, which is driven by a cross -coupling difference output stage with a 50Ω series output resistor. DRV134 has the characteristics of low differential output impedance (50 ) and high -co -mode output impedance (1.6k ), which is an ideal choice for audio applications. Usually,+VO is connected to+sense, -VO is connected to -SENSE, and the output is from these connections, as shown in Figure 1. For applications with large displacement errors of DC cables, it is recommended to install a 10μF electrolytic non -polar blocking capacitor at the foot of each sensor, as shown in Figure 2.

Excellent internal design and layout technology provides low signal distortion, high output level (+27DBU) and low noise flooring (–98DBU). The laser of the film resistance is fine -tuned to ensure good output co -mode suppression (OCMR) and signal balance ratio (SBR). In addition, the low -current voltage offset reduces errors and minimizes the load current.

In order to obtain the best system performance, it is recommended to use a high input impedance difference amplifier as a receiver. Use with INA134 (G 0dB) or INA137 (G ± 6dB) differential line receiver, DRV134 constitutes a complete solution for driving and receiving audio signals, replacing the input and output coupling transformers commonly used in professional audio systems (Figure Figure Figure Figure Figure Figure 2). When used with INA137 (G --6DB), the entire system gain is uniform.

Audio performance

DRV134 is designed to enhance communication performance. Very low distortion, low noise, and broadband band provide high -quality audio application superior performance. Laser fine -tuning matching resistance provides the best output co -mode suppression (usually 68DB), especially compared with the circuit of the use of computing amplifiers and discrete precision resistors. In addition, high conversion rates (15V/μs) and fast stability time (2.5 μs to 0.01%) ensure good dynamic response.

DRV134 has excellent distortion characteristics. For example, the distortion data provided in the typical performance curve, under various output conditions, THD+noise is lower than 0.003%in the entire audio range. Show the differential and single -end operation mode. In addition, the optional 10 μF blocking capacitor for minimizing VOCM errors has little effect on performance. Use the THD test circuit shown in FIG.Essence

About 10kHz, the distortion is lower than the measurement limit of the common test equipment. In addition, within the wider output voltage swing range, the distortion remains relatively constant (about 2.5V positive power and 1.5V negative electrode power supply). A special output -level topology generates a minimum distortion change from batch to batch and unit to unit. In addition, the small signal and large signal transient response curve proves the stability of DRV134 under the load.

Output co -mode inhibition

Output co -mode inhibitory (OCMR) is defined as a differential output voltage change caused by the output co -mode voltage change. When the OCMR is measured, VIN grounds and the output is applied to the co -mode voltage VCM, as shown in Figure 4. Ideally, the differential mode signal (VOD) should not occur. However, a small mode conversion effect generates an error signal, which is quantified by OCMR.

Signal balance ratio

Signal balance ratio (SBR) measured the symmetry of the output signal under the load conditions. In order to measure SBR, apply the input signal, and add the output, as shown in Figure 5. VOUT should be zero, because each output is ideal and opposite. However, the error signal is caused by any imbalance in the output. This error is legal with SBR. The impedance of the DRV134 output level is fine -tuning through laser, so as to minimize the SBR error. In the application, SBR also depends on the balance of the load network.

Single -end operation

DRV134 can run in a single -end mode without reducing the output driving capacity. Single -end operation requires the output pair of unavailable side (including VO and detection tube foot) to the low impedance circuit. Keep gain+6DB. As shown in Figure 6, the negative output grounding will generate non -reversing output signals (g +2), and the positive output grounding will generate reverse output signals (G – 2).

In order to suppress the noise and buzzing of the line, it is recommended to use differential mold operations. However, single -end performance is enough to meet many applications. Under normal circumstances, the single -end performance is equivalent to differentials (see THD+N typical performance curves), but the balance of co -mode and noise suppression capacity of the system inherent in the system is lost.

cable

DRV134 can transmit large signals to 600 loads through long cables. It is recommended to use low impedance shielding audio cables, such as Standard Baiitong 8451 or 9452 (or similar products), especially in applications that require longer cable lengths.

Thermal performance

DRV134 and DRV135 have strong output drive capabilities and excellent super temperature performance. In most applications, there are no significant differences between DIP, SOL-16 and SO-8 packaging.However, for the application of extreme temperature and load conditions, it is recommended to use SOL-16 (DRV134UA) or DIP (DRV134PA) packaging. In these cases, for example, if the load is greater than 600 or the cable is very long, the performance of the SO-8 (DRV135UA) package may be reduced.

Precautions for layout

Drive/receiver balance pair (such as DRV134 and INA137) can inhibit the voltage difference between ground ground ends at both ends of the cable, which may be caused by ground current, power changes, etc. of. In addition to proper bypass, the following suggestions should also be followed to achieve the best OCMR and noise suppression.

u0026#8226; DRV134 input shall be driven by low impedance sources, such as the operational amplifier or buffer.

u0026#8226; Like any single -end system, the power supply public line should be close to the ground of DRV134 as much as possible. Any ground offset error in the earthquake will reduce system performance.

u0026#8226; output should remain symmetrical.

u0026#8226; It is recommended that all twisted cables use shielding cables. The signal wiring should be kept physical balance. Different capacitors due to different wire lengths may cause uneven noise picking between wire pairs and reduce OCMR. Follow the industry's practice to ensure the correct system grounding of the cable.