Philips AN1651 V2 ±, 5.9mV, 25.6mV, 46.6mV, Strain Gauge Amplifier, Shielded Line, 0.5V, 2.50V

Philips Semiconductors	Application note
Using the NE/SA5234 amplifier	AN1651

	R	R
	10k	VCC
		VCC
		2							NE/SA5234	RECEIVE UNIT
	RS	4		T			±
				R			A1	+
	CC			A			+
				N				A2
		+		S				±	4700Ω
		±								RSH = 250Ω
	R1	11
	C1
		RF	SL00643							SL00644
Figure 15. Non-Inverting Biasing							Figure 16. A 4-20mA Current Loop
			V2	12k		1.2M
		4.3k		4.3k
									+5.0V
V2 ± V1	VO
			S.G.	S.G.	2		4
5.9mV	0.5V					+
		+5.0V							VO
25.6mV	2.50V					±		1
					3
46.6mV	4.63V	4.3k		4.3k				1k
S.G.: Matched Strain Gauge elements							11
				12k	1.2MΩ
										SL00645

Figure 17. Strain Gauge Amplifier

			+VCC
			1.2M
4.3k	4.3k
			4
S.G.	S.G.	2
		+	SIGNAL
	12kΩ
		±	1
		3
4.3k	4.3k		COM
			11
			Two-wire, Twisted-pair
	12kΩ	1.2MΩ	Shielded Line

SL00646

Figure 18. Remote Strain Gauge

	4-6V DC
	+	+3V
+	±
±	+	CMOS
	4V
	VR
	±

SL00647

Figure 19. Solar Regulator

1991 Oct 10